Power management backup method of vehicle and vehicle

Abstract

The application discloses a power management backup method of a vehicle and the vehicle, and the method comprises the following steps: in the mode that a keyless entry and start system controller is a power main control controller, if the keyless entry and start system controller is invalid or a power relay drive circuit of the keyless entry and start system controller is faulty, then the mode that a vehicle body control module is the power main control controller or the mode that the keyless entry and start system controller and the vehicle body control module cooperatively control power is entered; wherein, the keyless entry and start system controller and the vehicle body control module both integrate the function of system power mode management. In the application, the function of system power mode management is integrated in the PEPS controller and the BCM, when the PEPS controller is invalid or is faulty, the BCM can also realize the control on the system power relay, so that the power management function has the invalid backup function, and the safety performance of the whole vehicle is ensured.

Description

Technical Field

[0001] This application relates to the field of automotive technology, and more specifically, to a power management backup method for a vehicle and a vehicle. Background Technology

[0002] In existing technologies, the Passive Entry Passive Star (PEPS) controller integrates the function of system power mode management, used to control the switching of the system power mode between OFF, ACC, ON, and CRANK. However, the vehicle's power mode is controlled by a single controller. When this controller fails, the vehicle cannot be guaranteed to switch power modes, thus compromising the vehicle's safety performance. Summary of the Invention

[0003] This application provides a power management backup method and vehicle for a vehicle. The PEPS controller and BCM both integrate the function of system power mode management. When the PEPS controller fails or malfunctions, the BCM can also control the system power relay, so that the power management function has a failure backup function, ensuring the safety performance of the whole vehicle.

[0004] This application provides a power management backup method for a vehicle, including: when the keyless entry and start system controller is the main power controller, if the keyless entry and start system controller fails or the power relay drive circuit of the keyless entry and start system controller fails, then the system switches to a mode where the body control module is the main power controller or a mode where the keyless entry and start system controller and the body control module jointly control the power.

[0005] The keyless entry and start system controller and the body control module both integrate the function of system power mode management.

[0006] Preferably, in the mode where the keyless entry and start system controller is the main power controller, the first actual system power mode is determined by the first actual power mode issued by the keyless entry and start system controller and the power mode backup enable signal issued by the body control module being 0; the current logical power mode is determined by the second system power mode issued by the keyless entry and start system controller.

[0007] Preferably, at the same time the keyless entry and start system controller issues the second system power mode, the body control module issues the first power mode backup signal.

[0008] Preferably, if the keyless entry and start system controller issues a limp mode signal, the body control module enters the power master controller mode, and the body control module issues a power mode backup enable signal of 1.

[0009] Preferably, in the mode where the body control module is the main power controller, the second actual system power mode is determined by the second power mode backup signal issued by the body control module and the power mode backup enable signal of 1; the current logical power mode is determined by the second power mode backup signal issued by the body control module.

[0010] Preferably, in the mode where the keyless entry and start system controller is the main power controller, the body control module cooperates with the keyless entry and start system controller to switch the system power mode through the power relay backup request and system power mode switching request issued by the keyless entry and start system controller.

[0011] Preferably, in the mode where the keyless entry and start system controller is the main power controller, if the keyless entry and start system controller outputs a power relay backup request signal of 0, then the body control module does not perform power drive backup.

[0012] Preferably, in the mode where the keyless entry and start system controller is the main power controller, if the keyless entry and start system controller outputs a power relay backup request signal of 1, the body control module performs power drive backup.

[0013] If the keyless entry and start system controller sends a power relay fault signal of 1 and a system power mode switching request, the body control module will switch the system power mode according to the system power mode switching request.

[0014] Preferably, in the mode where the keyless entry and start system controller is the main power controller, if the keyless entry and start system controller detects that the engine is starting normally and outputs a power relay backup request signal of 1, the body control module performs power drive backup.

[0015] If the keyless entry and start system controller sends a signal indicating a power relay fault of 0 and a system power mode switching request, the body control module will switch the system power mode according to the system power mode switching request.

[0016] This application also provides a vehicle, including a keyless entry and start system controller and a body control module, wherein both the keyless entry and start system controller and the body control module integrate the function of system power mode management.

[0017] The keyless entry and start system controller and the body control module are used to perform the power management backup method described above.

[0018] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present application and, together with their description, serve to explain the principles of the present application.

[0020] Figure 1 This is a structural diagram of the vehicle provided in this application;

[0021] Figure 2 This is a schematic diagram of an embodiment of the PEPS controller and BCM handshake provided in this application. Detailed Implementation

[0022] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0023] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0024] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0025] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0026] This application provides a power management backup method and vehicle for a vehicle. The PEPS controller and BCM both integrate the function of system power mode management. When the PEPS controller fails or malfunctions, the BCM can also control the system power relay, so that the power management function has a failure backup function, ensuring the safety performance of the whole vehicle.

[0027] In this application, such as Figure 1 As shown, the vehicle includes a keyless entry and start system (PEPS) controller and a body control module (BCM), both of which integrate system power mode management functions. Specifically, both are connected to the system power supply via their respective power relays, which control the switching of the system power mode. Both the PEPS controller and the BCM drive their respective power relays in a low-drive manner, allowing the two modules to control the power relays in parallel.

[0028] In normal operating mode, the PEPS controller is responsible for controlling the system power mode, i.e., the PEPS controller is the main power controller. In the event of PEPS controller failure or a fault in the drive circuit of the PEPS controller's power relay, the BCM is responsible (i.e., the BCM is the main power controller) or the PEPS and BCM work together to control the system power mode, thereby solving the problems of instability and reliability in power management.

[0029] Specifically, the failure signal of the PEPS controller is directly output to the BCM via a hard-wired signal, which is a pulse width modulation (PWM) signal (0 / +12V). The CAN signal also includes a handshake failure signal between PEPS and BCM, exchanging relevant information in real time to ensure the reliability of the system's power management function.

[0030] If the PEPS controller is not faulty, it acts as the primary power controller. In PEPS primary mode, the BCM sends a network signal with power mode backup enabled set to 0 (i.e., PowerModBackEnable = 0) to indicate that the current system power control mode is PEPS primary mode.

[0031] In PEPS master control mode, the PEPS controller issues an actual power mode (PEPS_PROStat) signal (including OFF, ACC, ON, CRANK / START) based on the actual power mode feedback from the current power relay, and issues a system power mode (SystemPowerMode) signal to notify other electronic modules of the current logical power mode. Simultaneously with the PEPS controller issuing the system power mode signal, the BCM issues a power mode backup signal (PowerModeBackup). At this time, the power mode backup signal only serves as a backup of the current power mode, and its specific content can be ignored.

[0032] For other electronic modules, when using power mode, the actual system power mode is determined by the actual power mode issued by the PEPS controller and the power mode backup enable signal issued by the BCM being 0.

[0033] In PEPS master control mode, the PEPS controller controls the system power mode. In this mode, the BCM cooperates with the PEPS controller to switch between different power modes by receiving power relay backup requests (PowerRelayBackupReq) and system power mode switching requests (SystemPowerModeChangeReq) issued by PEPS.

[0034] With PowerModeBackEnable=0, the vehicle's power mode is controlled by the PEPS controller. When the PEPS controller is in control, there are two scenarios:

[0035] (1) When PowerRelayBackupReq=0, BCM does not need to participate in any power mode switching action and is in sub-mode one of PEPS master control at this time.

[0036] In sub-mode, the PEPS controller controls the system power supply and drives the power relays to achieve system power switching. The PEPS controller outputs a power relay backup request signal PowerRelayBackupReq=0 via CAN to notify the BCM that power drive backup is not required; it outputs a PEPS power relay drive circuit error signal of 0 (PEPSPDMDriverErrorInd=0) to notify the instrument panel that the current PEPS power relay drive circuit is normal; it outputs the actual power mode signal PEPS_PROStat to notify other electronic modules of the current actual working status of the power relays; and it outputs the system power mode signal SystemPowerMode to notify other electronic modules of the current PEPS logical power mode.

[0037] (2) When PowerRelayBackupReq=1, BCM drives the corresponding power relay according to the SystemPowerModeChangeReq signal issued by PEPS. If the power relay drive circuit of the current PEPS fails, it enters sub-mode two of PEPS master control; if the power relay drive circuit of the current PEPS is normal, it enters sub-mode three of PEPS master control.

[0038] In sub-mode two, the PEPS controller controls the system power supply but shuts down the power relay drive circuit integrated in the PEPS module. It then uses CAN to notify the BCM to drive the power relay inside the BCM to achieve system power switching. PEPS and BCM work together to achieve system power mode switching.

[0039] In this mode, the PEPS controller outputs a power relay backup request signal PowerRelayBackupReq=1 via CAN to notify the BCM to perform power drive backup; it outputs a PEPS power relay drive circuit fault signal of 1 (PEPSPDMDriverErrorInd=1) to notify the instrument panel that the current PEPS power relay drive circuit has failed; it outputs a system power mode change request SystemPowerModeChangeReq to notify the BCM how to drive the power relays to achieve power mode switching; it outputs an actual power mode signal PEPS_PROStat to notify other electronic modules of the current actual operating status of the power relays; and it outputs a system power mode signal SystemPowerMode to notify other electronic modules of the current logical power mode of PEPS.

[0040] Once PEPS detects that the engine has started normally, it enters sub-mode three. In sub-mode three, PEPS controls the system power supply and drives the power relay. At the same time, it notifies the BCM via CAN to drive the power relay inside the BCM to achieve system power switching. The PEPS controller and BCM drive their respective power relays in parallel.

[0041] In this mode, the PEPS controller outputs a power relay backup request signal PowerRelayBackupReq=1 via CAN to notify the BCM to perform power drive backup; it outputs a power relay drive circuit error signal of 0 (PEPSPDMDriverErrorInd=0) to notify the instrument panel that the current PEPS power relay drive circuit is normal; it outputs a system power mode change request SystemPowerModeChangeReq to notify the BCM how to drive the power relay to achieve power mode switching; it outputs an actual power mode signal PEPS_PROStat to notify other electronic modules of the current actual working status of the power relay; and it outputs a system power mode signal SystemPowerMode to notify other electronic modules of the current logical power mode of PEPS.

[0042] In PEPS master control mode, if the BCM receives a limp mode signal from the PEPS controller, it enters the mode of the BCM as the power master controller, that is, it enters the BCM master control mode. At this time, the BCM sends a signal to enable power mode backup as 1.

[0043] It should be noted that the limp mode signal specifically refers to the loss of the limphome square wave signal and the failure of the handshake.

[0044] The square wave signal is lost, that is, the abnormal time of the limp square wave signal exceeds the time threshold (e.g., 100ms). For example, the BCM does not receive the limp square wave signal for more than 100ms.

[0045] Specifically, BCM and PEPS determine whether the handshake has failed by judging the timing and the activity cycle counter.

[0046] like Figure 2 In the illustrated embodiment, PEPS and BCM periodically (with a period of Tcycle_Handshake, e.g., 90-110ms) perform a handshake via CAN. The PEPS controller sends a handshake request message, PEPS_Handshake, to the BCM. This message includes power management-related information and a PEPS handshake failure signal, PEPS_HandshakeFail. Upon receiving the PEPS handshake request message, the BCM must send a BCM handshake message, BCM_Handshake (including the BCM handshake failure signal BCM_HandshakeFail), within a third preset time, Twait_handshakeresp (e.g., 50ms), as a handshake response. Otherwise, PEPS will determine that the handshake between PEPS and BCM has failed. Conversely, if the BCM does not receive the PEPS handshake request message, PEPS_Handshake, within a second preset time, Twait_handshakeresp (e.g., 150ms), the BCM determines that the handshake between BCM and PEPS has failed. Table 1 shows an embodiment of the power management handshake time.

[0047]

[0048] During the handshake process between the PEPS controller and BCM, the activity cycle counter is continuously updated. When the PEPS controller first sends a handshake request message, the activity cycle counter PEPS_AliveCyclicCnt is 0. The BCM increments the value of the activity cycle counter BCM_AliveCyclicCnt by 1 in its handshake reply message. If the PEPS controller successfully receives the BCM handshake failure signal BCM_HandshakeFail = 0 and its activity cycle counter is 1, then one handshake is successfully completed. During the second handshake, PEPS again sends the PEPS handshake failure signal PEPS_HandshakeFail and changes its activity cycle counter value to 2 (incrementing the counter from the previous successful handshake by 1). If the BCM successfully completes the handshake, the activity cycle counter value sent by the BCM is 3, and so on. During the handshake process, if either PEPS or BCM detects a problem in the handshake process, it will set the corresponding handshake failure signal to 1.

[0049] During the handshake process, if the activity cycle counter in the BCM handshake response message received by the PEPS controller does not meet the condition, the PEPS controller determines that the handshake has failed. If the activity cycle counter in the PEPS handshake request message received by the BCM does not meet the condition (the correct value is the value of the activity cycle counter sent by the BCM during the last handshake plus 1), the handshake is determined to have failed.

[0050] Continuing from the above, in PEPS master control mode, if the BCM receives a limp mode signal from the PEPS controller, it indicates that the PEPS module has failed, and then enters the mode where the BCM is the power supply master controller, that is, enters the BCM master control mode.

[0051] As an example, the BCM integrates some functions of system power mode management. Specifically, the BCM can only switch between ACC / ON power mode and OFF power mode. In OFF or Crank mode, the BCM does not take over the power management master control, nor does it need to monitor limp hardwire signals and handshake signals, and assumes that the limp hardwire signal is normal and the CAN information handshake is successful.

[0052] If the PEPS controller issues a limp-mode signal, the BCM determines whether the current system power mode is ACC power mode or ON power mode; if so, it enters the BCM master control mode.

[0053] Specifically, when the BCM takes over the main power control, the following principles should be followed:

[0054] BCM should not take over power control in OFF or CRANK / START power modes;

[0055] If the power mode before the last handshake was successful was neither the OFF power mode nor the CRANK / START power mode, then the BCM will take over the power control by using the power mode before the last handshake was successful as the current system power mode.

[0056] If the power mode before the last handshake was successful was OFF or CRANK / START, and the current BCM power mode backup signal PowerModeBackup is neither OFF nor CRANK / START, then the BCM will take over power control by using the power mode indicated by the current PowerModeBackup as the current system power mode.

[0057] If the power mode before the last successful handshake and the current BCM's power mode backup signal PowerModeBackup are both OFF or CRANK / START, then the BCM should not take over power control. It should only take over power control after the BCM's power mode backup signal PowerModeBackup is no longer OFF or CRANK / START (i.e., switched to ACC or ON power mode), and under certain conditions (i.e., PEPS issues a limp-mode signal).

[0058] In BCM master control mode, BCM outputs a power mode backup enable signal of 1 (PowerModBackEnable=1) via CAN to notify other electronic modules that power management is now controlled by BCM master and that the system power mode signal SystemPowerMode issued by PEPS has been invalidated.

[0059] In BCM master control mode, BCM notifies other electronic modules of the current system power mode (OFF, ACC, ON, CRANK / START) by sending the PowerModeBackup signal. At this time, regardless of whether the PEPS controller can continue to send the SystemPowerMode signal, its content will be ignored.

[0060] For other electronic modules, when using power mode, the actual system power mode is determined by the power mode backup signal PowerModeBackup issued by the BCM and the power mode backup enable signal of 1 (PowerModBackEnable=1).

[0061] In BCM master control mode, if the current system power mode is ACC or ON, and the current vehicle speed is less than a threshold (e.g., 5 km / h), the BCM will switch the system power mode to OFF in response to a signal indicating that the one-button start switch has been pressed. If the user presses the one-button start switch again at this time, the BCM will not perform any operation on the power relay.

[0062] In BCM master control mode, if the current system power mode is ON and the current vehicle speed is greater than or equal to a threshold, then in response to a signal that the one-button start switch has been pressed and held for a first preset time (e.g., 2 seconds) or a signal that the one-button start switch has been pressed continuously a preset number of times (e.g., 3 times) within a second preset time period (e.g., 2 seconds), the BCM will switch the system power mode to ACC power mode and wait for the vehicle speed to fall below the threshold. If the vehicle speed falls below the threshold, then in response to a signal that the one-button start switch has been pressed, the BCM will switch the system power mode to OFF power mode.

[0063] In BCM master control mode, if the current system power mode is ACC power mode and the current vehicle speed is greater than or equal to the threshold, then wait for the vehicle speed to drop below the threshold. After the vehicle speed is less than the threshold, in response to receiving a signal that the one-button start switch has been pressed, BCM will switch the system power mode to OFF power mode.

[0064] In BCM master control mode, once the system power returns to the OFF state, it will remain in that OFF state. Since the PEPS module has failed, the previously recorded SystemPowerMode signal sent by the PEPS controller is invalid and cannot be used as a basis for power switching. If the BCM does not receive a new SystemPowerMode signal from the PEPS controller, it cannot use the previous value or set the default value "0," but will continue to wait. Only when the PEPS controller exits failure mode can the system power mode be switched to the non-OFF state.

[0065] When the BCM detects that the conditions for leaving the BCM master control mode are met, it will automatically relinquish power management master control. After a 500ms delay, the BCM will send a signal indicating that the power mode backup enable is 0 (PowerModBackEnable=0) to notify other electronic modules that the power management of the system is now controlled by PEPS. After the PEPS controller detects that the BCM outputs the signal PowerModBackEnable=0 via CAN, it will take over the power management master control and determine which power management control mode to switch to based on the actual situation.

[0066] The power management backup method proposed in this application is simple, stable, and reliable. It uses two existing controllers in the vehicle to back up the vehicle's power mode. This redundant design solves the problem that the vehicle power mode cannot be switched when the vehicle power mode management controller malfunctions, greatly improving the vehicle's stability and reliability.

[0067] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. A power management backup method for a vehicle, characterized in that, include: In the mode where the keyless entry and start system controller is the main power controller, if the keyless entry and start system controller fails or the power relay drive circuit of the keyless entry and start system controller malfunctions, the system will switch to the mode where the body control module is the main power controller or the mode where the keyless entry and start system controller and the body control module jointly control the power supply; wherein, both the keyless entry and start system controller and the body control module integrate the function of system power mode management. The keyless entry and start system controller is a PEPS controller, and the body control module is a BCM controller. Both are connected to the system power supply through their respective power relays. Simultaneously with the PEPS controller issuing the system power mode signal, the BCM controller also issues a power mode backup signal. This signal is used by both the PEPS and BCM controllers to collaboratively control the system power mode. Specifically, in the PEPS controller's master control mode, the BCM controller receives power relay backup requests and system power mode switching requests from the PEPS controller to cooperate with the PEPS controller in switching between different power modes. Each of the PEPS controller and the BCM controller is configured with its own power relay. At least in the PEPS controller master control mode, when there is a power relay backup request, the BCM controller drives the corresponding power relay according to the system power mode switching request signal issued by the PEPS controller. The system power mode switching request signal is used to notify the BCM controller how to drive the power relay to achieve power mode switching. If the current PEPS power relay drive circuit fails, it will enter sub-mode two of the PEPS main control mode: the PEPS controller still controls the system power supply, but shuts down the power relay drive circuit integrated in the PEPS, and at the same time notifies the BCM to drive the power relay in the BCM to achieve the switching of system power supply through CAN. If the current PEPS power relay drive circuit is normal, it enters sub-mode three of the PEPS master control: the PEPS controller controls the system power supply and drives the power relay, and at the same time notifies the BCM via CAN to drive the power relay in the BCM to realize the switching of system power supply, and the PEPS controller and the BCM controller drive their respective power relays in parallel.

2. The vehicle power management backup method according to claim 1, characterized in that, In the mode where the keyless entry and start system controller is the main power controller, the first actual system power mode is determined by the first actual power mode issued by the keyless entry and start system controller and the power mode backup enable signal issued by the body control module being 0; the current logical power mode is determined by the second system power mode issued by the keyless entry and start system controller.

3. The vehicle power management backup method according to claim 2, characterized in that, While the keyless entry and start system controller issues the second system power mode, the body control module issues the first power mode backup signal.

4. The vehicle power management backup method according to claim 1, characterized in that, If the keyless entry and start system controller issues a limp mode signal, the system enters the mode where the body control module is the main power controller, and the body control module issues a signal that the power mode backup enable is 1.

5. The vehicle power management backup method according to claim 4, characterized in that, In the mode where the body control module is the main power controller, the second actual system power mode is determined by the second power mode backup signal issued by the body control module and the power mode backup enable signal of 1; the current logical power mode is determined by the second power mode backup signal issued by the body control module.

6. The vehicle power management backup method according to claim 1, characterized in that, In the mode where the keyless entry and start system controller is the main power controller, the body control module cooperates with the keyless entry and start system controller to switch the system power mode through the power relay backup request and system power mode switching request issued by the keyless entry and start system controller.

7. The vehicle power management backup method according to claim 6, characterized in that, In the mode where the keyless entry and start system controller is the main power controller, if the keyless entry and start system controller outputs a power relay backup request signal of 0, then the body control module does not perform power drive backup.

8. The vehicle power management backup method according to claim 6, characterized in that, In the mode where the keyless entry and start system controller is the main power controller, if the keyless entry and start system controller outputs a power relay backup request signal of 1, then the body control module performs power drive backup. If the keyless entry and start system controller sends a power relay fault signal of 1 and a system power mode switching request, the body control module switches the system power mode according to the system power mode switching request.

9. The vehicle power management backup method according to claim 6, characterized in that, In the mode where the keyless entry and start system controller is the main power controller, if the keyless entry and start system controller detects that the engine is starting normally and outputs a power relay backup request signal of 1, then the body control module performs power drive backup. If the keyless entry and start system controller sends a signal that the power relay is faulty (0) and a system power mode switching request, the body control module will switch the system power mode according to the system power mode switching request.

10. A vehicle, characterized in that, It includes a keyless entry and start system controller and a body control module, both of which integrate system power mode management functions; The keyless entry and start system controller and the vehicle body control module are used to perform the power management backup method according to any one of claims 1-9.

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