Safe power-off system and method for new energy heavy truck

Abstract

According to the safe power-off system and method for the new energy heavy truck, the power-off delay relay is connected to the manual switch in parallel, so that the manual switch is directly switched off without key power when the truck is in the high-voltage state, and the wake-up power of the whole truck controller can still be kept until the whole truck controller judges that the wake-up power can be switched off at the moment; further, the vehicle control unit is dormant; meanwhile, the self state is led out from the manual switch, the on-off state of a key ON gear awakening electric loop of the vehicle control unit is controlled through a relay, the manual switch is switched off when the key switch is in the ON gear, an ON gear signal of the vehicle control unit disappears at the moment, and the vehicle control unit starts to execute the high-voltage lowering process; the high-voltage flow under the vehicle control unit is specifically divided into the steps that the manual switch is switched off in the normal high-voltage state, the manual switch is switched off when intelligent power supply is activated, and the manual switch is switched off when a gun is inserted for charging.

Description

Technical Field

[0001] The invention relates to a system and method for safely powering off a new energy heavy-duty truck, belonging to the technical field of power management for new energy heavy-duty trucks. Background Art

[0002] With the popularity of new energy commercial vehicles and the increasing market share, it is inevitable that the manual switch of the vehicle will be disconnected when the vehicle is at high voltage, which will cause damage to the rear-end load. The existing mainstream power-off modes lack the protection of safe power-off by disconnecting the manual switch, and the terminal market inevitably has load dumping operations such as directly disconnecting the manual switch during actual use, which further causes the rear-end high-voltage load to generate instantaneous large current reverse breakdown of the front-end relay or fuse at the moment of losing input, causing damage to the vehicle's high-voltage components. Summary of the invention

[0003] The purpose of the present invention is to provide a safe power-off system and method for new energy heavy-duty trucks. By connecting a power-off delay relay in parallel to the manual switch, the manual switch can be directly disconnected without interrupting the key switch power when the vehicle is in a high-voltage state. The wake-up power of the VCU controller can still be maintained, the entire vehicle can safely complete the unloading operation, and execute the high-voltage release process according to the set program, and can complete the high-voltage release operation within the set time.

[0004] In order to achieve the above objectives / solve the above technical problems, the present invention is implemented by adopting the following technical solutions.

[0005] In a first aspect, the present invention provides a safe power-off system for a new energy heavy truck, comprising: a battery, a first power-off delay relay, a VCU fuse, a key switch, a double-pole single-throw manual switch, a first diode, a delayed power-off fuse, a second power-off delay relay and a VCU controller; The positive electrode of the battery is respectively connected to the first static contact of the double-pole single-throw manual switch and the moving contact of the first power-off delay relay, the static contact of the first power-off delay relay is connected to the first moving contact of the double-pole single-throw manual switch, the first moving contact of the double-pole single-throw manual switch is also respectively connected to the static contact of the key switch and the static contact of the second power-off delay relay, the moving contact of the key switch is connected to the second moving contact of the double-pole single-throw manual switch, and the second static contact of the double-pole single-throw manual switch is connected to the ON electrical wake-up terminal of the VCU controller through the first diode, The moving contact of the second power-off delay relay is used to connect each high-voltage accessory relay, and the high-voltage accessory relay includes: a first power-off delay relay, the negative pole of the coil of the second power-off delay relay is connected to the power-off delay control terminal controlled by the VCU, and when the VCU controller is awakened, a low-effective signal is output to energize the coil to attract the second power-off delay relay, the positive pole of the coil of the second power-off delay relay is connected to the first moving contact of the double-pole single-throw manual switch, the negative pole of the coil of the first power-off delay relay is grounded, the positive pole of the coil of the first power-off delay relay is connected to the moving contact of the second power-off delay relay, and when the second power-off delay relay is closed, the coil of the first power-off delay relay is energized to attract the first power-off delay relay, and the negative pole of the battery is grounded.

[0006] Furthermore, it also includes a second diode and a third diode; the A+ auxiliary power input system is connected to the ON electrical wake-up terminal of the VCU controller through the second diode, which is used to wake up the VCU controller when the gun is plugged in for charging, and the VCU controller executes the upper and lower high-voltage logic of charging; The intelligent power replenishment system is connected to the ON power wake-up end of the VCU controller through a third diode, and the intelligent power replenishment system is connected to the intelligent power replenishment request signal end of the VCU controller. When the intelligent power replenishment system determines that the intelligent power replenishment function needs to be activated, it wakes up the VCU controller and the intelligent power replenishment request signal end of the VCU controller is valid. Then the VCU controller executes the intelligent power replenishment logic.

[0007] Furthermore, it also includes an all-in-one DCDC input module, the two ends of which are respectively connected to the positive electrode of the battery and the ground, and is used to convert the 600V high voltage electricity of the power battery carried by the vehicle into 27V low voltage electricity to charge the battery.

[0008] Furthermore, a VCU fuse is provided between the first moving contact of the double-pole single-throw manual switch and the static contact of the key switch; and a delayed power-off fuse is provided between the first moving contact of the double-pole single-throw manual switch and the static contact of the second power-off delay relay.

[0009] In a second aspect, the present invention provides a new energy heavy truck safe power-off method based on the new energy heavy truck safe power-off system, comprising the following steps: Turn the key switch to the ON position, the key ON position switch is closed, and the manual switch is disconnected. When the conditions for the lower high-voltage process are met, the lower high-voltage process is executed; When the high voltage process is completed, the VCU controller controls the power-down delay control terminal to continue to output a low level until a certain set delay time is reached; The VCU controller stops outputting low level (low level), the power-off delay relay is disconnected, and the vehicle stops drawing power from the battery.

[0010] Furthermore, the lower high pressure process conditions specifically include: The ON gear wake-up signal of the VCU controller disappears for more than 1s, and it is judged that the current vehicle speed is less than 5KM / h.

[0011] The ON signal of the VCU controller disappears, the VCU controller prohibits the motor controller from being enabled and controls the motor to stop torque output. When the VCU controller receives feedback from the drive motor that the state is off, it stops enabling high-voltage accessories (turns off the high-voltage electrical appliances, such as air pump, oil pump, DCDC, air conditioner, PTC, and all-in-one feedback auxiliary drive state is stopped); then the VCU controller detects the working state of the hydrogen fuel controller, vehicle speed and battery current. When the vehicle speed is less than 5km / h, the absolute value of the battery current is less than 10A, and the working state received from the hydrogen fuel controller is standby or fault (including hydrogen fuel controller communication loss), , first disconnect the main positive relay, then disconnect the auxiliary drive relay, air conditioning, and PTC relay. After the VCU controller detects the disconnection state of the main positive relay, it sends a quick power-off command to the motor controller to quickly drop the voltage of the motor controller to the safe voltage range (below 36V); when the main positive relay and auxiliary drive relay are disconnected, the VCU controller sends a high-voltage power-off command again. After receiving it, the battery controller determines the main circuit current. When the main circuit current is less than 15A, the main negative relay is disconnected and the high-voltage power-on state is no longer fed back. When the VCU controller receives the main negative relay disconnection state fed back by the battery controller, the high-voltage power-off is completed.

[0012] Furthermore, when the lower high pressure process conditions are not met: If the A+ charging wake-up signal or intelligent charging signal of the VCU controller is valid, the VCU controller does not execute the high voltage process; If the charging gun is plugged in, the A+ charging wake-up signal is continuously output to wake up the VCU controller. The VCU controller determines the current key switch position. If the key switch is not in the ON position and the intelligent charging signal is invalid, the VCU controller executes the charging upper and lower high voltage logic; If the battery voltage is lower than 24.5V, the intelligent charging system will output an intelligent charging signal to wake up the VCU controller. The VCU controller determines the current key switch position. If the key switch is not in the ON position and the intelligent charging signal is valid, the VCU controller executes the intelligent charging up and down high voltage logic.

[0013] Furthermore, the calculation of the current vehicle speed specifically includes: ; In the formula, V is the current vehicle speed, n is the gearbox output shaft speed, r is the tire radius, i g is the rear axle speed ratio, i 0Main reducer transmission ratio.

[0014] Furthermore, the VCU controller controls the power-down delay control terminal to continue to output a low level until a certain set delay time is reached, specifically including: After the VCU controller is awakened, its power-off delay control terminal continuously outputs a low level; 8s after the VCU controller wake-up signal disappears, its power-off delay control terminal stops outputting a low level.

[0015] Furthermore, the VCU controller stops outputting a low level, the power-off delay relay is disconnected, and the vehicle stops drawing power from the battery, specifically including: The coil of the second power-off delay relay is de-energized, and then the moving contact of the second power-off delay relay is disconnected, and each high-voltage accessory relay and the coil of the first power-off delay relay are de-energized; The coil of the first power-off delay relay is de-energized, and then the moving contact of the first power-off delay relay is disconnected, and the entire vehicle stops drawing power from the battery.

[0016] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention connects a power-off delay relay in parallel to the manual switch to realize direct disconnection of the manual switch without interrupting the key power when the vehicle is in a high-voltage state, and the wake-up power of the vehicle controller can still be maintained until the vehicle controller determines that the wake-up power can be disconnected at this time, and then the vehicle controller goes into sleep, and the unloading operation can be completed safely, and the high-voltage process can be executed according to the set process, and the high-voltage operation can be completed within the set time, which is safe and efficient.

[0017] When the vehicle of the present invention is in different states (normal high-voltage mode, charging high-voltage mode, and intelligent power replenishment mode), disconnecting the manual switch can ensure the normal high voltage of the rear-end load, and will not cause relay adhesion or IGBT breakdown, motor damage or battery damage, thereby ensuring the safety of the vehicle's high-voltage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Shown is a schematic diagram of the principle of a safe power-off system for new energy heavy-duty trucks. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solution of the present invention, rather than limitations on the technical solution of the present invention. The embodiments of the present invention and the technical features in the embodiments may be combined with each other unless there is a conflict.

[0020] The term "and / or" is only a description of the association relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " generally indicates that the related objects are in an "or" relationship. Example

[0021] like Figure 1 An embodiment shown, this embodiment 1 provides a new energy heavy truck safe power-off system, including: a battery 2, a first power-off delay relay 6, a VCU fuse 10, a key switch 8, a double-pole single-throw manual switch 7, a first diode 4, a delayed power-off fuse 9, a second power-off delay relay 5 and a VCU controller 1; The positive pole of the battery 2 is respectively connected to the first static contact of the double-pole single-throw manual switch 7 and the moving contact of the first power-off delay relay 6, the static contact of the first power-off delay relay 6 is connected to the first moving contact of the double-pole single-throw manual switch 7, the first moving contact of the double-pole single-throw manual switch 7 is also respectively connected to the static contact of the key switch 8 and the static contact of the second power-off delay relay 5, the moving contact of the key switch 8 is connected to the second moving contact of the double-pole single-throw manual switch 7, the second static contact of the double-pole single-throw manual switch 7 is connected to the ON electric wake-up terminal 15 of the VCU controller 1 through the first diode 4, the moving contact of the second power-off delay relay 5 is used to connect each high-voltage accessory relay 14, the high-voltage accessory The component relay 14 includes: a first power-off delay relay 6; the negative pole of the coil of the second power-off delay relay 5 is connected to the power-off delay control terminal 17 controlled by the VCU, and when the VCU controller 1 is awakened, a low-effective signal is output to energize the coil to attract the second power-off delay relay 5, the positive pole of the coil of the second power-off delay relay 5 is connected to the first moving contact of the double-pole single-throw manual switch 7, the negative pole of the coil of the first power-off delay relay 6 is grounded, and the positive pole 11 of the coil of the first power-off delay relay 6 is connected to the moving contact of the second power-off delay relay 5. When the second power-off delay relay 5 is closed, the coil of the first power-off delay relay 6 is energized to attract the first power-off delay relay 6, and the negative pole of the battery 2 is grounded.

[0022] It also includes a second diode and a third diode; the A+ auxiliary power input system 12 is connected to the ON electrical wake-up terminal 15 of the VCU controller 1 through the second diode, which is used to wake up the VCU controller 1 when the gun is plugged in for charging, and the VCU controller 1 executes the upper and lower high-voltage logic of charging; The intelligent power replenishment system 13 is connected to the ON power wake-up terminal 15 of the VCU controller 1 through a third diode, and the intelligent power replenishment system 13 is connected to the intelligent power replenishment request signal terminal 16 of the VCU controller 1. When the intelligent power replenishment system 13 determines that the intelligent power replenishment function needs to be activated, the VCU controller 1 is woken up and the intelligent power replenishment request signal terminal 16 of the VCU controller 1 is valid, then the VCU controller 1 executes the intelligent power replenishment logic.

[0023] It also includes an all-in-one DCDC input module 3, both ends of which are connected to the positive electrode of the battery 2 and the ground, respectively, and is used to convert the 600V high voltage electricity of the power battery carried by the vehicle into 27V low voltage electricity to charge the battery 2.

[0024] A VCU fuse 10 is arranged between the first moving contact of the double-pole single-throw manual switch 7 and the static contact of the key switch 8; a delayed power-off fuse 9 is arranged between the first moving contact of the double-pole single-throw manual switch 7 and the static contact of the second power-off delay relay 5. Example

[0025] This embodiment provides a method for safely powering off a new energy heavy truck, comprising the following steps: turning a key switch to the ON position, closing the key ON position switch, disconnecting the manual switch, and executing the high-voltage power-off process when the high-voltage power-off process conditions are met; When the ON gear wake-up signal of the VCU controller disappears for more than 1s, the VCU controller prohibits the motor controller from being enabled and controls the motor to stop torque output. When the VCU controller receives feedback from the drive motor that the state is off, it stops enabling high-voltage accessories (turns off high-voltage electrical appliances, such as air pumps, oil pumps, DCDC, air conditioners, PTC, and all-in-one feedback auxiliary drive states are stopped); then the VCU controller detects the working state of the hydrogen fuel controller, vehicle speed and battery current. When the vehicle speed is less than 5km / h, the absolute value of the battery current is less than 10A and the working state received from the hydrogen fuel controller is standby or fault (including hydrogen fuel controller communication After the VCU controller detects the disconnection state of the main positive relay, it sends a fast power-off command to the motor controller to quickly drop the voltage of the motor controller to a safe voltage range (below 36V); when receiving the disconnection status of the main positive relay and the auxiliary drive relay, the VCU controller sends a high-voltage power-off command again. After receiving it, the battery controller determines the main circuit current. When the main circuit current is <15A, the main negative relay is disconnected and the high-voltage power-on status is no longer fed back. When the VCU controller receives the disconnection status of the main negative relay fed back by the battery controller, the high-voltage power-off is completed.

[0026] The calculation of the current vehicle speed specifically includes: ; In the formula,V is the current vehicle speed, n is the gearbox output shaft speed, r is the tire radius, i g is the rear axle speed ratio, i 0 Main reducer transmission ratio.

[0027] When the lower high pressure process conditions are not met: If the A+ charging wake-up signal or intelligent charging signal of the VCU controller is valid, the VCU controller does not execute the high voltage process; If the charging gun is plugged in, the A+ charging wake-up signal is continuously output to wake up the VCU controller. The VCU controller determines the current key switch position. If the key switch is not in the ON position and the intelligent charging signal is invalid, the VCU controller executes the charging upper and lower high voltage logic; If the battery voltage is lower than 24.5V, the intelligent charging system will output an intelligent charging signal to wake up the VCU controller. The VCU controller determines the current key switch position. If the key switch is not in the ON position and the intelligent charging signal is valid, the VCU controller executes the intelligent charging up and down high voltage logic.

[0028] When the high voltage process is completed, the VCU controller controls the power-down delay control terminal to continue to output a low level until a certain set delay time is reached, specifically including: After the VCU controller is awakened, its power-off delay control terminal continuously outputs a low level; 8s after the VCU controller wake-up signal disappears, its power-off delay control terminal stops outputting a low level The VCU controller stops outputting a low level, the power-off delay relay is disconnected, and the vehicle stops drawing power from the battery. Specifically, the following steps are performed: The coil of the second power-off delay relay is de-energized, and then the moving contact of the second power-off delay relay is disconnected, and each high-voltage accessory relay and the coil of the first power-off delay relay are de-energized; The coil of the first power-off delay relay is de-energized, and then the moving contact of the first power-off delay relay is disconnected, and the entire vehicle stops drawing power from the battery.

[0029] The whole vehicle of the present invention is in a high-voltage working condition. If the manual switch is directly disconnected, the whole vehicle can safely complete the unloading operation, and execute the lower high-voltage process according to the set process, and can complete the lower high-voltage operation within the set time, which is safe and efficient.

[0030] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0031] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0032] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0033] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0034] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which all fall within the protection of the present invention.

Claims

1. A safe power-off system for new energy heavy trucks, characterized in that: include: Battery, first power-off delay relay, key switch, double-pole single-throw manual switch, first diode, second power-off delay relay and VCU controller; The positive electrode of the battery is respectively connected to the first static contact of the double-pole single-throw manual switch and the moving contact of the first power-off delay relay, the static contact of the first power-off delay relay is connected to the first moving contact of the double-pole single-throw manual switch, the first moving contact of the double-pole single-throw manual switch is also respectively connected to the static contact of the key switch and the static contact of the second power-off delay relay, the moving contact of the key switch is connected to the second moving contact of the double-pole single-throw manual switch, the second static contact of the double-pole single-throw manual switch is connected to the ON electrical wake-up terminal of the VCU controller through the first diode, the moving contact of the second power-off delay relay is used to connect each high-voltage accessory relay, the negative pole of the coil of the second power-off delay relay is connected to the power-off delay control terminal controlled by the VCU, and when the VCU controller is awakened, a low effective signal is output to enable the coil to be energized to attract the second power-off delay relay, and the positive pole of the coil of the second power-off delay relay is connected to the first moving contact of the double-pole single-throw manual switch; The negative pole of the coil of the first power-off delay relay is grounded, and the positive pole of the coil of the first power-off delay relay is connected to the moving contact of the second power-off delay relay. When the second power-off delay relay is closed, the coil of the first power-off delay relay is energized to attract the first power-off delay relay, and the negative pole of the battery is grounded. The high-voltage accessory relay includes: a first power-off delay relay.

2. The new energy heavy truck safe power-off system according to claim 1 is characterized in that: It also includes a second diode and a third diode; the A+ auxiliary power input system is connected to the ON electrical wake-up terminal of the VCU controller through the second diode, which is used to wake up the VCU controller when the gun is plugged in for charging, and the VCU controller executes the upper and lower high-voltage logic of charging; The intelligent power replenishment system is connected to the ON power wake-up end of the VCU controller through a third diode, and the intelligent power replenishment system is connected to the intelligent power replenishment request signal end of the VCU controller. When the intelligent power replenishment system determines that the intelligent power replenishment function needs to be activated, it wakes up the VCU controller and the intelligent power replenishment request signal end of the VCU controller is valid. Then the VCU controller executes the intelligent power replenishment logic.

3. The new energy heavy truck safe power-off system according to claim 1 is characterized in that: It also includes an all-in-one DCDC input module, the two ends of which are respectively connected to the positive pole of the battery and the ground, and is used to convert the 600V high voltage electricity of the power battery on the vehicle into 27V low voltage electricity to charge the battery.

4. The new energy heavy truck safe power-off system according to claim 1 is characterized in that: A VCU fuse is provided between the first moving contact of the double-pole single-throw manual switch and the static contact of the key switch; A delayed power-off fuse is arranged between the first moving contact of the double-pole single-throw manual switch and the static contact of the second power-off delay relay.

5. A method for safely powering off a new energy heavy truck based on the safe power-off system for a new energy heavy truck according to any one of claims 1 to 4, characterized in that: The following steps are involved: Turn the key switch to the ON position, the key ON position switch is closed, and the manual switch is disconnected. When the conditions for the lower high-voltage process are met, the lower high-voltage process is executed; When the high voltage process is completed, the VCU controller controls the power-down delay control terminal to continue to output a low level until a certain set delay time is reached; The VCU controller stops outputting a low level, the power-off delay relay is disconnected, and the vehicle stops drawing power from the battery.

6. The method for safely shutting down a new energy heavy truck according to claim 5 is characterized in that: The lower high pressure process conditions specifically include: The ON gear wake-up signal of the VCU controller disappears for more than 1s, and it is judged that the current vehicle speed is less than 5KM / h.

7. The method for safely shutting down a new energy heavy truck according to claim 5 is characterized in that: When the lower high pressure process conditions are not met: If the A+ charging wake-up signal or intelligent charging signal of the VCU controller is valid, the VCU controller does not execute the high voltage process; If the charging gun is plugged in, the A+ charging wake-up signal is continuously output to wake up the VCU controller. The VCU controller determines the current key switch position. If the key switch is not in the ON position and the intelligent charging signal is invalid, the VCU controller executes the charging upper and lower high voltage logic; If the battery voltage is lower than 24.5V, the intelligent charging system will output an intelligent charging signal to wake up the VCU controller. The VCU controller determines the current key switch position. If the key switch is not in the ON position and the intelligent charging signal is valid, the VCU controller executes the intelligent charging up and down high voltage logic.

8. The method for safely shutting down a new energy heavy truck according to claim 6 is characterized in that: The calculation of the current vehicle speed specifically includes: ； In the formula, V is the current vehicle speed, n is the gearbox output shaft speed, r is the tire radius, i g is the rear axle speed ratio, i 0 Main reducer transmission ratio.

9. The method for safely shutting down a new energy heavy truck according to claim 5 is characterized in that: The VCU controller controls the power-down delay control terminal to continue to output a low level until a certain set delay time is reached, specifically including: After the VCU controller is awakened, its power-off delay control terminal continuously outputs a low level; 8s after the VCU controller wake-up signal disappears, its power-off delay control terminal stops outputting a low level.

10. The method for safely shutting down a new energy heavy truck according to claim 5, characterized in that: The VCU controller stops outputting a low level, the power-off delay relay is disconnected, and the vehicle stops drawing power from the battery. The details include: The coil of the second power-off delay relay is de-energized, and then the moving contact of the second power-off delay relay is disconnected, and each high-voltage accessory relay and the coil of the first power-off delay relay are de-energized; The coil of the first power-off delay relay is de-energized, and then the moving contact of the first power-off delay relay is disconnected, and the entire vehicle stops drawing power from the battery.

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