Power-off delay control system and control method for new energy vehicle

Abstract

The invention discloses a power-off delay control system and method for a new energy vehicle, and belongs to the technical field of new energy automobiles, the power-off delay control system comprises a low-voltage control circuit and a high-voltage system, the low-voltage control circuit comprises a low-voltage storage battery pack, a power main switch S, a first relay K1, a second relay K2 and a controller, the controller comprises a whole vehicle controller, a motor controller, a gateway, an instrument, a gas-electricity controller, a battery management system and an all-in-one controller; the high-voltage system comprises a high-voltage power battery, a power battery distribution box, an all-in-one controller, a boosting module, a hydrogen pile, a motor controller, a driving motor and an auxiliary driving module; overall control of the high-voltage system is achieved through the vehicle control unit, and by adding relay control, normal high-voltage related operation of a gas-electricity system and a pure-electricity system can still be achieved after a driver turns off a power main switch.

Description

Technical Field

[0001] The invention relates to a power-off delay control system and a control method for a new energy vehicle, belonging to the technical field of new energy vehicles. Background Art

[0002] In recent years, the rapid development of new energy vehicle technology has greatly promoted the iteration and upgrading of new energy vehicles. Coupled with the strong support of policies, a prosperous situation has been formed in which pure electric, hydrogen fuel, hybrid and other routes are running side by side. Hydrogen fuel cell vehicles have become the object of competition for research and development by major OEMs because of their true zero emission, pollution-free and renewable nature. Hydrogen fuel cell vehicles have two systems, pure electric and fuel-electric, and the operation of the vehicle is more complicated. The start, operation and stop of the pure electric and fuel-electric systems are directly related to the high-voltage safety of the whole vehicle. Especially in the process of lowering high voltage, the hydrogen stack needs to complete the tasks of load reduction, load clearing, purging, and shutdown. Other high-voltage systems such as motor controllers, fuel-electric DC converters and auxiliary drives need to be actively or passively discharged, and at the same time, necessary communications need to be completed. This must ensure that the relevant systems do not lose power during the above process, that is, to ensure a certain period of power-off delay, otherwise it will seriously affect the life of the fuel-electric system and bring safety hazards.

[0003] At present, the power-off delay function of new energy heavy trucks has the following main defects: First, it relies on the self-control of each controller, and the controllers communicate through the CAN line, lacking unified coordination of the whole vehicle. The second is the limitation of the power mode selection of each controller. At present, the power mode of each controller either chooses to connect the battery B+ power or chooses to connect the 30 power output by the main power switch. If the B+ power that cannot be cut off by the main power switch is selected, the battery is prone to power loss due to the existence of static current. If the 30 power that can be cut off by the main power switch is selected, if the driver turns off the main power switch, the fuel-electric system and the pure electric system will not be able to complete the normal high-voltage operation. If the driver does not turn off the main power switch, because the fuel-electric system and the pure electric system need time to normally lower the high voltage, it will cause unnecessary waiting time for the driver, and it will also cause the battery to lose power. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a new energy vehicle power-off delay control system and control method. The system and method achieve overall control of the high-voltage system by adopting a vehicle controller, and by adding relay control, the driver can still achieve normal high-voltage related operations of the fuel-electric system and the pure electric system after turning off the main power switch; at the same time, by defining the power mode, the static current consumption is reduced and the battery life is extended.

[0005] To achieve the above object, the present invention is implemented by adopting the following technical solutions: In a first aspect, the present invention provides a new energy vehicle power-off delay control system, comprising: A low-voltage control circuit, the low-voltage control circuit includes a low-voltage battery pack, a main power switch S, a first relay K1, a second relay K2 and a controller, the controller includes a vehicle controller, a motor controller, a gateway, an instrument, a fuel-electric controller, a battery management system and an all-in-one controller, wherein: the positive electrode of the low-voltage battery is connected to the input end of the main power switch S and the input end of the first relay K1; the output end of the main power switch S is connected to the power supply pins of various controllers and the output end of the first relay K1 and the input end of the second relay K2; the X1-1 pin of the vehicle controller is connected to the control input end of the first relay K1, the X1-2 pin is connected to the control input end of the second relay K2, and the X1-4 pin is connected to the ignition lock T15; the control outputs of the first relay K1 and the second relay K2 and the negative poles of various controllers are all connected to the negative pole of the battery; A high-voltage system, the high-voltage system includes a high-voltage power battery, a power battery distribution box, an all-in-one controller, a boost module, a hydrogen stack, a motor controller, a drive motor and an auxiliary drive module, wherein: the high-voltage power battery is connected to the power battery distribution box through a high-voltage line; the all-in-one controller and the boost module are connected in parallel to the battery distribution box through a high-voltage line, and the boost module is connected to the hydrogen stack through a high-voltage line; the all-in-one controller is also connected to the motor controller and the auxiliary drive module through a high-voltage line; the motor controller is connected to the drive motor through a high-voltage line.

[0006] Furthermore, the all-in-one controller integrates a pre-charging circuit, a main drive contactor and an auxiliary drive contactor. The pre-charging circuit is used to control the high-voltage charging current, the main drive contactor is used to control the high-voltage supply of the motor controller, and the auxiliary drive contactor is used to control the high-voltage supply of the auxiliary drive module.

[0007] Furthermore, the vehicle controller communicates with the motor controller, gateway, instrument, fuel-electric controller, battery management system and all-in-one controller via the CAN bus.

[0008] In a second aspect, the present invention provides a control method for a power-off delay control system of a new energy vehicle according to any one of the aforementioned methods, comprising: Vehicle power-on process: The main power switch S is closed, the ignition switch is turned to T15, and various controllers are powered on to wake up and self-check. After the vehicle controller self-checks and no faults are found, the first relay K1 and the second relay K2 are controlled to close to supply power to the high-voltage system; Vehicle high voltage process: When the ignition switch is turned to START, the vehicle controller executes the high voltage command and controls the closing of the contactor of the high voltage system through communication messages, so that the fuel-electric system and the pure electric system enter the working mode; Vehicle power-off process: When the ignition switch is turned to the OFF position, the vehicle controller executes the power-off delay strategy according to the ignition switch status and the working condition of the fuel-electric system, controls the high-voltage system to reduce the high voltage in a predetermined order, and after both the fuel-electric system and the pure electric system have completed the high voltage reduction, controls the first relay K1 to disconnect, thereby cutting off the power of the entire vehicle.

[0009] Furthermore, during the vehicle power-off process, when the ignition switch is turned to the OFF position and the main power switch S is not disconnected, the vehicle controller maintains the enable output of pins X1-1 and X1-2 until the fuel-electric system completes load reduction, load clearing, purging, and shutdown, and sends a completion instruction, and then executes the vehicle high-voltage power-off process.

[0010] Furthermore, the vehicle high-voltage reduction process includes: after the vehicle controller receives the completion instruction sent by the fuel-electric system; the auxiliary drive contactor and the main drive contactor are disconnected; and the main positive contactor and the main negative contactor of the high-voltage power battery are disconnected through the battery management system.

[0011] Furthermore, during the process of powering off the whole vehicle, if the main power switch S is turned off directly or the main power switch S is turned off during the powering off process of the whole vehicle, the whole vehicle controller maintains the enable output of the X1-1 pin until the fuel-electric system is shut down and the pure electric system completes the high voltage reduction, and then controls the first relay K1 to disconnect and the whole vehicle is powered off.

[0012] Furthermore, the control of closing the contactors of the high-voltage system through communication messages includes: receiving communication messages through the battery management system to close the main negative contactor, receiving communication messages through the all-in-one controller, closing the main positive contactor and pre-charging circuit of the all-in-one controller, and closing the main drive contactor and auxiliary drive contactor according to the vehicle control strategy.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a power-off delay control system and control method for new energy vehicles. The system and method realize overall control of the high-voltage system by adopting a vehicle controller, and by adding relay control, the driver can still realize normal high-voltage related operations of the fuel-electric system and the pure electric system after turning off the main power switch. At the same time, by defining the power mode, the static current consumption is reduced and the battery life is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is the schematic diagram of the low-voltage control circuit for power-off delay.

[0015] Figure 2 This is the schematic diagram of the high voltage architecture.

[0016] Figure 3 It is a network topology diagram.

[0017] Figure 4It is the delay flow chart for powering on and off the whole vehicle. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0021] Embodiment 1, this embodiment introduces a new energy vehicle power-off delay control system, including: a low-voltage battery pack, a main power switch S, a first relay K1, a second relay K2, a vehicle controller, a motor controller, a gateway, an instrument, a fuel-electric controller, a battery management system and an all-in-one controller.

[0022] The low-voltage battery in the system provides power for the whole vehicle, the main power switch S is used to cut off the power of the whole vehicle, the first relay K1 realizes the power-off delay control of the main power supply, the second relay K2 controls the power of the high-voltage system related to the power-off delay, the motor controller is responsible for motor control and power-off delay operation, the gateway is responsible for the communication routing of the whole vehicle, the instrument is used for the necessary alarm indication of the power-off delay, the fuel-electric controller is responsible for the power-off delay control of the fuel-electric system, the battery management system is responsible for the power-off delay control of the power battery system, and the all-in-one controller is responsible for the power-off delay control of the pre-charging circuit, the main drive contactor, and the auxiliary drive contactor, wherein the pre-charging circuit, the main drive contactor, and the auxiliary drive contactor are integrated in the all-in-one controller, the pre-charging circuit is used to control the high-voltage charging current, the main drive contactor is used to control the high-voltage supply of the motor controller, and the auxiliary drive contactor is used to control the high-voltage supply of the auxiliary drive module.

[0023] Figure 1 The low-voltage control circuit shown includes: a low-voltage battery pack, a main power switch S, a first relay K1, a second relay K2, a vehicle controller, a motor controller, a gateway, an instrument, a fuel-electric controller, a battery management system and an all-in-one controller.

[0024] The positive pole of the low-voltage battery is connected to the input end of the main power switch S, and is also connected to the input end of the first relay K1. The output end of the main power switch S is connected to the power supply pins of various controllers, and is also connected to the output end of the first relay K1 and the input end of the second relay K2. The X1-1 pin of the vehicle controller is connected to the control input end of the first relay K1, the X1-2 pin is connected to the input end of the second relay K2, and the X1-4 pin is connected to the ignition lock T15. The control outputs of the first relay K1 and the second relay K2 and the negative poles of various controllers are connected to the negative pole of the battery.

[0025] Figure 2 The high-voltage architecture shown includes: high-voltage power battery, power battery distribution box, all-in-one controller, boost module, hydrogen stack, motor controller, drive motor, and auxiliary drive module.

[0026] The high-voltage power battery is connected to the power battery distribution box through a high-voltage line. The all-in-one controller is connected in parallel with the boost module through a high-voltage line and connected to the battery distribution box. The boost module is connected to the hydrogen stack through a high-voltage line. The all-in-one controller is also connected to the motor controller and auxiliary drive through a high-voltage line. The motor controller is connected to the drive motor through a high-voltage line.

[0027] Figure 3The network topology of the associated components is shown in the figure. The network nodes include: vehicle controller, motor controller, gateway, instrument, fuel-electric controller, battery management system and all-in-one controller. The gateway has three network segments, namely CAN1, CAN3 and CAN4. Network segment CAN1 is connected to the vehicle controller, motor controller and all-in-one controller. Network segment CAN3 is connected to the battery management system. Network segment CAN4 is connected to the instrument. The vehicle controller is connected to the fuel-electric controller through network segment CAN2. Communication between various controllers is achieved through CAN lines.

[0028] Figure 4 It is a delay flow chart for powering on and off the vehicle, combined with Figure 3 Detailed description of the vehicle power-on and power-off delay process. Close the main power switch S, turn the ignition lock to T15, enable the output of pins X1-1 and X1-2, and close the first relay K1 and the second relay K2. The second relay K2 is closed to wake up the vehicle controller, motor controller, gateway, instrument, fuel-electric controller, battery management system and all-in-one controller.

[0029] The ignition lock is turned to START, and the vehicle controller executes the high-voltage command. The battery management system closes the main negative contactor and main positive contactor of the power battery; the vehicle controller message controls the multi-in-one closing of the pre-charge and main drive contactors; after the high voltage is completed, a READY signal is sent and an auxiliary drive contactor pull-in command is sent; accessories such as the oil pump, air pump, and DCDC are executed according to the strategy.

[0030] Driving operations such as the hydrogen fuel switch, the fuel-electric system starts when the vehicle status information is determined. The vehicle controller sends a start-up command; the fuel-electric controller controls the fuel-electric system to start and sends a start success command; the vehicle controller determines the power battery SOC value and the hydrogen stack SOC value; the vehicle controller outputs the power demand value and current limit value based on the SOC value and vehicle information; when the SOC is lower than 20%, the power output is limited, and when the SOC is lower than 12%, the vehicle speed is limited.

[0031] When the ignition lock is OFF or T15 is disconnected, the delayed power-off operation and high voltage are performed. The vehicle controller receives the power-off command; the X1-1 and X1-2 pins of the vehicle controller continue to enable the output; the first relay K1 is closed and the second relay K2 is closed; the fuel-electric controller receives the power-off command of the vehicle controller; the fuel-electric system starts to perform load reduction, purge and other operations, and after completion, the fuel-electric system contactor and fuel-electric system boost module are cut off; the instrument "hydrogen stack purge" warning; the motor actively discharges. The process of reducing high voltage of the vehicle: the vehicle controller receives the "complete" command of the fuel-electric system; the multi-in-one auxiliary drive is turned off, and the auxiliary drive contactor is disconnected; the multi-in-one main drive is turned off, and the main drive contactor is disconnected; the battery management system disconnects the main positive contactor and main negative contactor of the power battery.

[0032] Embodiment 2: This embodiment provides a control method for a new energy vehicle power-off delay control system according to any one of Embodiment 1, including: Vehicle power-on process: The main power switch S is closed, the ignition switch is turned to T15, and various controllers are powered on to wake up and self-check. The vehicle controller self-checks without faults, the X1-1 pin and X1-2 pin enable output, the first relay K1 and the second relay K2 are closed. The second relay K2 outputs power to wake up the motor controller, gateway, instrument, fuel-electric controller, battery management system and all-in-one controller, and each controller self-checks.

[0033] Vehicle high voltage process: Turn the ignition switch to START, and the vehicle controller executes the high voltage command. The battery management system receives the communication message and closes the main negative contactor. The communication message is received through the all-in-one controller, and the main positive contactor and pre-charge circuit of the all-in-one controller are closed, and the main drive contactor and auxiliary drive contactor are closed according to the vehicle control strategy. The fuel-electric system enters the working mode according to the vehicle control strategy.

[0034] There are two scenarios for powering off the vehicle: Turn off the key but leave the main power switch on. Turn off the key but leave the main power switch on.

[0035] 1) The ignition switch is turned to OFF, the main power switch S is not disconnected, and the vehicle is powered off. The vehicle controller detects the X1-4 pin signal and the working status of the fuel-electric system, and starts to execute the power-off delay strategy according to the vehicle status. The vehicle controller X1-1 pin and X1-2 pin enable output are maintained, and the instrument pops up an alarm that the fuel-electric system needs to be purged. The fuel-electric system completes load reduction, load clearing, purging, and shutdown and sends completion instructions. The vehicle controller receives the instructions and executes the high-voltage process of the pure electric system.

[0036] 2) When the ignition switch is turned to OFF, if the driver directly turns off the main power switch S or turns off the main power switch S during the vehicle power-off process, because the X1-1 pin enable output is maintained, the first relay K1 will not be disconnected and will continue to provide power to the vehicle until the fuel-electric system is shut down and the pure electric system completes the high voltage, then the first relay K1 is disconnected and the vehicle is powered off.

[0037] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A power-off delay control system for new energy vehicles, characterized in that: include: A low-voltage control circuit, the low-voltage control circuit includes a low-voltage battery pack, a main power switch S, a first relay K1, a second relay K2 and multiple controllers, the multiple controllers include a vehicle controller, a motor controller, a gateway, an instrument, a fuel-electric controller, a battery management system and an all-in-one controller, wherein: the positive electrode of the low-voltage battery is connected to the input end of the main power switch S and the input end of the first relay K1; the output end of the main power switch S is connected to the power supply pins of multiple controllers and the output end of the first relay K1 and the input end of the second relay K2; the X1-1 pin of the vehicle controller is connected to the control input end of the first relay K1, the X1-2 pin is connected to the control input end of the second relay K2, and the X1-4 pin is connected to the ignition lock T15; the control outputs of the first relay K1 and the second relay K2 and the negative poles of the multiple controllers are all connected to the negative pole of the battery; A high-voltage system, the high-voltage system includes a high-voltage power battery, a power battery distribution box, an all-in-one controller, a boost module, a hydrogen stack, a motor controller, a drive motor and an auxiliary drive module, wherein: the high-voltage power battery is connected to the power battery distribution box through a high-voltage line; the all-in-one controller and the boost module are connected in parallel to the battery distribution box through a high-voltage line, and the boost module is connected to the hydrogen stack through a high-voltage line; the all-in-one controller is also connected to the motor controller and the auxiliary drive module through a high-voltage line; the motor controller is connected to the drive motor through a high-voltage line.

2. The power-off delay control system for new energy vehicles according to claim 1 is characterized in that: The all-in-one controller integrates a pre-charging circuit, a main drive contactor and an auxiliary drive contactor. The pre-charging circuit is used to control the high-voltage charging current, the main drive contactor is used to control the high-voltage supply of the motor controller, and the auxiliary drive contactor is used to control the high-voltage supply of the auxiliary drive module.

3. The power-off delay control system for new energy vehicles according to claim 2 is characterized in that: The vehicle controller communicates with the motor controller, gateway, instrument, fuel-electric controller, battery management system and all-in-one controller via the CAN bus.

4. A control method for a power-off delay control system for a new energy vehicle according to claim 3, characterized in that: include: Vehicle power-on process: The main power switch S is closed, the ignition switch is turned to T15, and various controllers are powered on to wake up and self-check. After the vehicle controller self-checks and no faults are found, the first relay K1 and the second relay K2 are controlled to close to supply power to the high-voltage system; Vehicle high voltage process: When the ignition switch is turned to START, the vehicle controller executes the high voltage command and controls the closing of the contactor of the high voltage system through communication messages, so that the fuel-electric system and the pure electric system enter the working mode; Vehicle power-off process: When the ignition switch is turned to the OFF position, the vehicle controller executes the power-off delay strategy according to the ignition switch status and the working condition of the fuel-electric system, controls the high-voltage system to reduce the high voltage in a predetermined order, and after both the fuel-electric system and the pure electric system have completed the high voltage reduction, controls the first relay K1 to disconnect, thereby cutting off the power of the entire vehicle.

5. The power-off delay control system for new energy vehicles according to claim 4 is characterized in that: During the vehicle power-off process, when the ignition switch is turned to the OFF position and the main power switch S is not disconnected, the vehicle controller maintains the enable output of pins X1-1 and X1-2 until the fuel-electric system completes load reduction, load clearing, purging, and shutdown, and sends a completion command, and then executes the vehicle high-voltage power-off process.

6. The power-off delay control system for new energy vehicles according to claim 5, characterized in that: The vehicle high-voltage reduction process includes: after the vehicle controller receives the completion instruction sent by the fuel-electric system; the auxiliary drive contactor and the main drive contactor are disconnected; and the main positive contactor and the main negative contactor of the high-voltage power battery are disconnected through the battery management system.

7. The power-off delay control system for new energy vehicles according to claim 4, characterized in that: During the vehicle power-off process, if the main power switch S is turned off directly or during the vehicle power-off process, the vehicle controller maintains the enable output of the X1-1 pin until the fuel-electric system is shut down and the pure electric system completes the high voltage reduction, and then controls the first relay K1 to disconnect and the vehicle is powered off.

8. The control method of the power-off delay control system of a new energy vehicle according to claim 4, characterized in that: The control of closing the contactor of the high-voltage system through the communication message includes: receiving the communication message through the battery management system to close the main negative contactor, receiving the communication message through the all-in-one controller, closing the main positive contactor and the pre-charging circuit of the all-in-one controller, and closing the main drive contactor and the auxiliary drive contactor according to the vehicle control strategy.

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