Automotive brake-by-wire system

Abstract

The utility model relates to a kind of automobile brake-by-wire systems, including multiple brake actuators, vehicle body controller, brake area controller, brake-by-wire pedal brake awakener based on the state of brake-by-wire pedal to multiple brake actuators is braked and awakens;Brake-by-wire pedal brake awakener includes the displacement of brake-by-wire pedal for real-time monitoring and when displacement reaches preset displacement threshold, output pedal in place monitoring signal of wake-up module, for when power is turned on, backup brake awakens source signal is outputted by backup awakens source, set between whole vehicle power supply and backup awakens source and when receiving pedal in place monitoring signal, the wake-up switch of closure;Whole vehicle power supply is connected with wake-up module, and backup awakens source is respectively connected with each brake actuator, brake area controller communication connection.The utility model uses brake-by-wire pedal as the backup signal of wake-up brake, greatly prevents brake failure caused by brake area controller failure, and shortens the time required for wake-up brake.

Description

Technical Field

[0001] This utility model relates to a brake-by-wire system for automobiles, and in particular to a brake wake-up architecture used therein. Background Technology

[0002] As attached Figure 1 As shown, the brake-by-wire system of an automobile includes four brake actuators 103-106, a vehicle power supply 100, a brake domain controller 102, a brake-by-wire pedal 101, a hard-wire wake-up source 107, and a CAN wake-up source 108, etc. Among them, the hard-wire wake-up source 107 and the CAN wake-up source 108 are generally integrated in the body controller 109.

[0003] Currently, the wake-up schemes used in the brake-by-wire system include the following two: (1) When the vehicle door is opened or the vehicle is started, a hard-wire wake-up signal is sent through the hard-wire wake-up source 107 to activate the brake domain controller 102 and the brake actuators 103-106; (2) A CAN wake-up signal 1 is sent through the CAN wake-up source 108 to first wake up the brake domain controller 102. After the brake domain controller 102 is activated, it sends a CAN wake-up signal 2 to activate the brake actuators 103-106. After the system is modified, it can perform normal braking functions.

[0004] The drawbacks of the aforementioned prior art are as follows: Brake actuators 103-106 only receive the CAN wake-up signal from the brake domain controller 102. Although the brake domain controller 102 implements a safety redundancy design, there is still a risk of overall failure. When the brake domain controller 102 fails, brake actuators 103-106 cannot receive the CAN wake-up signal, posing a safety hazard. Furthermore, when the brake drive pedal 101 is pressed, the mechanical switch signal of the brake drive pedal 101 first activates the traditional body controller 109, and the body controller 109 then activates the brake drive system through the hard-wire wake-up source 107 or the CAN wake-up source 108. The excessively long hardware startup time also poses a certain safety risk. Summary of the Invention

[0005] The purpose of this invention is to provide a complete automotive brake-by-wire system that can reduce the risk of failure, save braking start time, and achieve safe braking.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A vehicle brake-by-wire system includes multiple brake actuators, a body controller, and a brake domain controller. The body controller and the brake domain controller are respectively communicatively connected to the multiple brake actuators. The vehicle brake-by-wire system also includes a brake-by-wire pedal brake wake-up device that wakes up the multiple brake actuators based on the state of the vehicle's brake-by-wire pedal.

[0008] The drive-by-wire pedal brake wake-up device includes a wake-up module for real-time monitoring of the displacement of the drive-by-wire pedal and outputting a pedal position monitoring signal when the displacement reaches a preset displacement threshold; a backup wake-up source for outputting a backup brake wake-up source signal when the power is turned on; and a wake-up switch disposed between the vehicle power supply and the backup wake-up source and closed when the pedal position monitoring signal is received. The vehicle power supply is connected to the wake-up module, and the backup wake-up source is communicatively connected to each of the brake actuators and the brake domain controller.

[0009] Based on the specific implementation of this application, the backup wake-up source is provided with a current-limiting short-circuit protection circuit.

[0010] According to one embodiment of this application, the brake actuator includes a brake-side microprocessor, a brake-side power supply module, and a brake-side backup wake-up signal sampling module. The backup wake-up source is communicatively connected to the brake-side power supply module and the brake-side backup wake-up signal sampling module, respectively. The brake-side power supply module and the brake-side backup wake-up signal sampling module are communicatively connected to the brake-side microprocessor, respectively.

[0011] Furthermore, the brake actuator also includes a brake-side main wake-up signal sampling module, which is communicatively connected to the brake-side microprocessor and the body controller.

[0012] According to one embodiment of this application, the braking domain controller includes a control-side microprocessor, a control-side power supply module, and a control-side backup wake-up signal sampling module. The backup wake-up source is communicatively connected to the control-side power supply module and the control-side backup wake-up signal sampling module, respectively. The control-side power supply module and the control-side backup wake-up signal sampling module are communicatively connected to the control-side microprocessor, respectively.

[0013] Furthermore, the braking domain controller also includes a control-side main wake-up signal sampling module, which is communicatively connected to the control-side microprocessor and the body controller.

[0014] Furthermore, the braking domain controller also includes a wake-up output module, which is communicatively connected to the control-side microprocessor and the body controller.

[0015] The body controller includes a hardwired wake-up source that is communicatively connected to each of the brake actuators and the brake domain controller. The body controller also includes a CAN wake-up source that is communicatively connected to the brake domain controller.

[0016] Preferably, the vehicle brake-by-wire system includes four of the aforementioned brake actuators.

[0017] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art: This utility model uses the drive-by-wire pedal as a backup signal for waking up the brake, which greatly eliminates the brake failure caused by the failure of the brake domain controller, thereby shortening the time required to wake up the brake and enabling rapid braking in emergency situations. Attached Figure Description

[0018] Appendix Figure 1 This is a schematic diagram of the architecture of an existing automotive brake-by-wire system.

[0019] Appendix Figure 2 This is a schematic diagram of the architecture of the automotive brake-by-wire system of this utility model. Detailed Implementation

[0020] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0021] Example 1: As shown in the attached document Figure 1 As shown, a vehicle brake-by-wire system includes multiple brake actuators (e.g., four brakes 103-106), a body controller 109, a brake domain controller 102, and a brake-by-wire pedal wake-up device 1010 disposed within the brake-by-wire pedal 101. The body controller 109 and the brake domain controller 102 are communicatively connected to the multiple brake actuators 103-106, respectively, in the same way as existing solutions.

[0022] The drive-by-wire pedal brake wake-up device 1010 (drive-by-wire pedal sensor module 1010) is used to implement the backup brake wake-up function. Specifically, it is used to wake up multiple brake actuators 103-106 based on the state of the vehicle's drive-by-wire pedal 101. The specific solution is as follows: the drive-by-wire pedal brake wake-up device 1010 includes a wake-up module 10100, a backup wake-up source 10102, and a wake-up switch 10101. The vehicle power supply 100 is connected to the wake-up module 10100 to supply power. The wake-up module 10100 is used to monitor the displacement of the drive-by-wire pedal 101 in real time and outputs a pedal position monitoring signal when the displacement reaches a preset displacement threshold. The wake-up switch 10101 is located between the vehicle power supply 100 and the backup wake-up source 10102, and is also connected to the wake-up module 10100. When the wake-up switch 10101 receives a pedal position monitoring signal from the wake-up module 10100, it closes, thereby powering on the backup wake-up source 10102. When powered on, the backup wake-up source 10102 outputs a backup brake wake-up source signal (hard-wired wake-up source 2 signal). The backup wake-up source 10102 is communicatively connected to each brake actuator 103-106 and the brake domain controller 102, thus sending the backup brake wake-up source signal to each brake actuator 103-106 and the brake domain controller 102. In this embodiment, considering the safety of the vehicle power supply 100, a current limiting short circuit protection circuit is provided in the backup wake-up source 10102 to provide current limiting short circuit protection function. Therefore, the backup wake-up source 10102 can also be called the current limiting short circuit protection module 10102.

[0023] All brake actuators 103-106 have the same structure; the following description uses brake actuator 103 as an example. Brake actuator 103 includes a brake-side microprocessor 1031, a brake-side power supply module 1030, and a brake-side backup wake-up signal sampling module 1032. Since brake actuator 103 is also communicatively connected to the body controller 109, it also includes a brake-side main wake-up signal sampling module 1033. Both the brake-side backup wake-up signal sampling module 1032 and the brake-side main wake-up signal sampling module 1033 are ADC sampling modules. Backup wake-up source 10102 is communicatively connected to both the brake-side power supply module 1030 and the brake-side backup wake-up signal sampling module 1032, enabling it to output backup brake wake-up source signals to both the brake-side power supply module 1030 and the brake-side backup wake-up signal sampling module 1032. The brake-side power supply module 1030 and the brake-side backup wake-up signal sampling module 1032 are communicatively connected to the brake-side microprocessor 1031. When the brake-side power supply module 1030 receives the backup brake wake-up source signal, it is enabled to output the power required by the brake-side microprocessor 1031. When the brake-side backup wake-up signal sampling module 1032 receives the backup brake wake-up source signal, it transmits it to the brake-side microprocessor 1031, enabling the brake-side microprocessor 1031 to identify the source of the hard-wired wake-up signal. The brake-side main wake-up signal sampling module 1033 is communicatively connected to the brake-side microprocessor 1031 and the body controller 109. When the body controller 109 outputs the main wake-up signal (hard-wired wake-up source 1 signal) to the brake actuator 103, the brake-side main wake-up signal sampling module 1033 receives the main wake-up signal and transmits it to the brake-side microprocessor 1031, enabling the brake-side microprocessor 1031 to identify the source of the hard-wired wake-up signal.

[0024] The braking domain controller 102 includes a control-side microprocessor 1021, a control-side power module 1020, and a control-side backup wake-up signal sampling module 1022. Since the braking domain controller 102 is also communicatively connected to the body controller 109, it further includes a control-side main wake-up signal sampling module 1024 and a wake-up output module 1023. Both the control-side backup wake-up signal sampling module 1022 and the control-side main wake-up signal sampling module 1024 are ADC sampling modules. The backup wake-up source 10102 is communicatively connected to both the control-side power module 1020 and the control-side backup wake-up signal sampling module 1022, enabling it to output a backup braking wake-up source signal to both the control-side power module 1020 and the control-side backup wake-up signal sampling module 1022. The control-side power supply module 1020 and the control-side backup wake-up signal sampling module 1022 are communicatively connected to the control-side microprocessor 1021. When the control-side power supply module 1020 receives the backup braking wake-up source signal, it is enabled to output the power required by the control-side microprocessor 1021. When the control-side backup wake-up signal sampling module 1022 receives the backup braking wake-up source signal, it transmits it to the control-side microprocessor 1021, enabling the control-side microprocessor 1021 to identify the source of the hard-wired wake-up signal. The control-side main wake-up signal sampling module 1024 is communicatively connected to the control-side microprocessor 1021 and the body controller 109. When the body controller 109 outputs the main wake-up signal (hard-wired wake-up source 1 signal) to the braking domain controller 102, the control-side main wake-up signal sampling module 1024 receives the main wake-up signal and transmits it to the control-side microprocessor 1021, enabling the control-side microprocessor 1021 to identify the source of the hard-wired wake-up signal. The wake-up output module 1023 is communicatively connected to the control-side microprocessor 1021 and the body controller 109. After the control-side microprocessor 1021 identifies and confirms the source of the hard-wired wake-up signal, it outputs a wake-up signal through the wake-up output module 1023 to activate the body controller 109.

[0025] The body controller includes a hard-wired wake-up source 107 and a CAN wake-up source 108. The hard-wired wake-up source 107 is communicatively connected to each brake actuator 103-106 and the brake domain controller 102, respectively, and the CAN wake-up source 108 is communicatively connected to the brake domain controller 102.

[0026] The working principle of the above-mentioned automotive brake-by-wire system is as follows:

[0027] 1) The body controller 109 sends a hard-wire wake-up signal through the hard-wire wake-up source 107 to activate the brake domain controller 102 and the brake actuators 103-106. After the brake domain controller 102 is activated, it provides the power required by the drive-by-wire pedal sensor modules 1010 and 1011 of the drive-by-wire pedal 101. Each module of the drive-by-wire braking system will enter the normal working mode to meet the corresponding braking requirements.

[0028] 2) Alternatively, the body controller 109 first activates the brake domain controller 102 via the CAN wake-up source 108. After the brake domain controller 102 is activated, it sends the CAN wake-up source signal 2 to activate the brake actuators 103~106. At the same time, the brake domain controller 102 provides the power required by the drive-by-wire pedal sensor modules 1010 and 1011 of the drive-by-wire pedal 101. Each module of the drive-by-wire braking system will enter the normal working mode to meet the corresponding braking requirements.

[0029] 3) When the whole vehicle enters the sleep state, the drive-by pedal 101 also enters the sleep state, but the whole vehicle power supply 100 continues to supply power to the drive-by pedal sensor module 1010 inside the drive-by pedal 101 so that the drive-by pedal sensor module 1010 can realize the function of self-wake-up.

[0030] 4) When the vehicle is in a dormant state, if the driver is still inside, regulations require that when the driver presses the drive-by-wire pedal 101, the braking system must provide the necessary braking force to achieve vehicle braking. In this scenario, when the drive-by-wire pedal 101 is pressed, the wake-up module 10100 monitors the displacement change of the drive-by-wire pedal 101 in real time. Once the displacement pressed by the driver exceeds a preset displacement threshold, the wake-up module 10100 will activate the wake-up switch 10101, allowing the vehicle power supply 100 to directly pass through and enter the current limiting short-circuit protection module 10102. Under normal circumstances, the current limiting short-circuit protection module 10102 will output a hard-wired wake-up source 2 signal to directly activate the braking domain controller 102 and the brake actuators 103~106.

[0031] 5) When the braking domain controller 102 receives the hard-wired wake-up source 2 signal, the control-side power module 1020 will be enabled and output the power required by the control-side microprocessor 1021. After the control-side microprocessor 1021 starts up, it identifies and confirms the source of the hard-wired wake-up source through the control-side backup wake-up signal sampling module 1022 (the hardware wake-up source 1 signal is identified through the control-side main wake-up signal sampling module 1024). After the control-side microprocessor 1021 confirms, it outputs a wake-up signal from the control wake-up output module 1023 to activate the body controller 109.

[0032] 6) At least one of the brake actuators 103 to 106 receives the hard-wired wake-up source 2 signal. Taking brake actuator 103 as an example, the hardware wake-up source 2 signal enables the brake-side power module 1030. The brake-side power module 1030 will provide the power required by the brake-side microprocessor 1031 and start working. The brake-side microprocessor 1031 identifies and confirms the source of the hardware wake-up source through the brake-side backup wake-up signal sampling module 1032 (the same hardware wake-up source 1 signal is identified through the brake-side main wake-up signal sampling module 1033). After confirmation, the brake actuator 103 immediately provides braking force to achieve braking in order to meet regulations and ensure system safety.

[0033] 7) During normal vehicle operation, if the braking domain controller 102 (generally a redundant domain controller) fails and cannot function, the brake actuators 103-106 will not receive braking requests from the braking domain controller 102, and the conventional system will be helpless in this situation. This invention provides a corresponding solution in this case. At this time, the driver can depress the drive-by-wire pedal 101, and the output of the hardware wake-up source 2 signal can be identified and confirmed by the brake-side backup wake-up signal sampling module 1032. One of the brake actuators 103-106 acts as the main controller (103 is used as an example in this paper) to coordinate the system to implement the backup braking function and ensure vehicle safety.

[0034] 8) During normal vehicle operation, if the system works normally and the CAN communication between the brake domain controller 102 and the brake actuators 103-106 is normal, the priority will be higher than the signal request from the hard-wired wake-up source 2. The braking system will be uniformly coordinated and the braking request will be implemented by the brake domain controller 102.

[0035] This invention introduces a drive-by-wire pedal 101 based on existing technology. The drive-by-wire pedal 101 simultaneously provides pedal displacement signals and an electronic wake-up switch using mature chip technology. When the brake domain controller 102 fails, the brake actuators 103-106 can receive the electronic wake-up switch signal from the drive-by-wire pedal 101. The brake actuators 103-106 then use their internal modules to detect the wake-up source and decide whether to automatically implement safe braking. Even when the brake domain controller 102 is functioning correctly, if the entire system is in sleep mode, pressing the drive-by-wire pedal 101 will quickly output a hard-wire wake-up signal, directly activating the brake actuators 103-106 and the brake domain controller 102. This enables rapid power-on and braking, saving hardware startup time and ensuring greater safety for the drive-by-wire system.

[0036] The beneficial effects of the above scheme are:

[0037] 1) A hard-wired wake-up signal for the drive-by-wire pedal has been added as a backup control signal, which greatly eliminates the risk of brake failure caused by the failure of the brake domain controller;

[0038] 2) By activating the brake domain controller and brake actuator through hard-wired wake-up of the brake pedal, the internal wake-up mechanism of the braking system is realized. It does not rely on external components of the braking system to participate in the wake-up, which greatly shortens the delay caused by the wake-up start-up time and realizes rapid braking in emergency situations.

[0039] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A brake-by-wire system for automobiles, comprising a plurality of brake actuators, a body controller, and a brake domain controller, wherein the body controller and the brake domain controller are respectively communicatively connected to the plurality of brake actuators, characterized in that: The vehicle brake-by-wire system also includes a brake-by-wire pedal brake waker that wakes up multiple brake actuators based on the state of the vehicle's brake-by-wire pedal. The drive-by-wire pedal brake wake-up device includes a wake-up module for real-time monitoring of the displacement of the drive-by-wire pedal and outputting a pedal position monitoring signal when the displacement reaches a preset displacement threshold; a backup wake-up source for outputting a backup brake wake-up source signal when the power is turned on; and a wake-up switch disposed between the vehicle power supply and the backup wake-up source and closed when the pedal position monitoring signal is received. The vehicle power supply is connected to the wake-up module, and the backup wake-up source is communicatively connected to each of the brake actuators and the brake domain controller.

2. The automotive brake-by-wire system according to claim 1, characterized in that: The backup wake-up source is equipped with a current-limiting short-circuit protection circuit.

3. The automotive brake-by-wire system according to claim 1, characterized in that: The brake actuator includes a brake-side microprocessor, a brake-side power supply module, and a brake-side backup wake-up signal sampling module. The backup wake-up source is communicatively connected to the brake-side power supply module and the brake-side backup wake-up signal sampling module, respectively. The brake-side power supply module and the brake-side backup wake-up signal sampling module are communicatively connected to the brake-side microprocessor, respectively.

4. The automotive brake-by-wire system according to claim 3, characterized in that: The brake actuator also includes a brake-side main wake-up signal sampling module, which is communicatively connected to the brake-side microprocessor and the body controller.

5. The automotive brake-by-wire system according to claim 1, characterized in that: The braking domain controller includes a control-side microprocessor, a control-side power supply module, and a control-side backup wake-up signal sampling module. The backup wake-up source is communicatively connected to the control-side power supply module and the control-side backup wake-up signal sampling module, respectively. The control-side power supply module and the control-side backup wake-up signal sampling module are communicatively connected to the control-side microprocessor, respectively.

6. The automotive brake-by-wire system according to claim 5, characterized in that: The braking domain controller also includes a control-side main wake-up signal sampling module, which is communicatively connected to the control-side microprocessor and the body controller.

7. The automotive brake-by-wire system according to claim 6, characterized in that: The braking domain controller also includes a wake-up output module, which is communicatively connected to the control-side microprocessor and the body controller.

8. The automotive brake-by-wire system according to claim 1, characterized in that: The body controller includes a hardwired wake-up source that is communicatively connected to each of the brake actuators and the brake domain controller.

9. The automotive brake-by-wire system according to claim 1, characterized in that: The body controller includes a CAN wake-up source that is communicatively connected to the brake domain controller.

10. The automotive brake-by-wire system according to claim 1, characterized in that: It includes four of the aforementioned brake actuators.

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