A vehicle power-off control circuit

Abstract

The present invention provides a vehicle power-off control circuit, including a low-voltage delay module, wherein the power-off delay module includes: a power supply unit and a main control unit, one end of the main control unit is connected to the power supply unit; a control unit, whose input end is connected to the other end of the main control unit to switch on and off according to the high and low levels input by the main control unit; its first output end is connected to the power supply unit, and the second output end is connected to the gateway control unit to input the power supply of the power supply unit to the gateway control unit. The vehicle power-off control circuit of the present invention controls whether the power supply connection between the normal power and the gateway control unit is connected through the power-off delay module, thereby reducing the difficulty of circuit control and the occurrence of faults.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile circuits, and in particular to a vehicle power-off control circuit. Background Art

[0002] With the rapid development of new energy vehicles, new energy vehicles currently use a design control method for power-off delay. The low-voltage power delay design can ensure that the entire vehicle is powered off at the moment of powering off, providing power to support the normal operation of other modules and ensuring the power-off of the entire vehicle.

[0003] When a new energy vehicle is powered off, when the vehicle controller issues a power-off command, each high-voltage actuator makes a safe and reasonable power-off sequence, and when the vehicle is powered off, the power supply of the vehicle is interrupted. In order to ensure that all components and the vehicle can work, additional power supply needs to be connected to achieve delayed power-off.

[0004] In the prior art, when the vehicle is powered off, it is necessary to connect the normal power supply to the wake-up circuit of the vehicle controller through a low-voltage wiring harness, and then control the on-off state of the delay circuit through a delay relay. However, this method requires an additional control terminal to control the on-off state of the delay relay, that is, to add a control circuit, which increases the control difficulty. Summary of the invention

[0005] Based on this, an object of the present invention is to provide a vehicle power-off control circuit to solve the problem of additional control terminals in the background technology, which leads to increased control difficulty.

[0006] In one aspect, the present invention provides a vehicle power-off control circuit, including a low-voltage delay module, wherein the power-off delay module includes:

[0007] A power supply unit and a main control unit, one end of the main control unit is connected to the power supply unit;

[0008] A control unit, whose input end is connected to the other end of the main control unit to be turned on and off according to the high and low levels input by the main control unit; whose first output end is connected to the power supply unit, and whose second output end is connected to the gateway control unit to input the power supply of the power supply unit to the gateway control unit when the control unit is turned on.

[0009] The vehicle power-off control circuit in the present invention is connected to one end of the main control unit through the control unit in the power-off delay module, and is turned on and off according to the high and low levels of the main control unit to control whether the normal power is connected to the gateway control unit. By utilizing the power supply of the entire vehicle, it is avoided to add an additional circuit to control the delay circuit. At the same time, by utilizing the power supply of the entire vehicle, it is avoided to connect an additional power supply, thereby reducing the difficulty of circuit control and the occurrence of faults.

[0010] Furthermore, the control unit includes a transistor, the base of the transistor is connected to the main control unit, the emitter is connected to the power supply unit, and the collector is connected to the gateway control unit. When the base of the transistor is at a high level, the transistor is turned on to connect the power supply unit to the gateway control unit.

[0011] Furthermore, the circuit also includes a high-voltage discharge module, and the high-voltage discharge module includes:

[0012] The vehicle control unit and the motor control unit are connected via a CAN line;

[0013] A three-phase line unit connected to a motor control unit via a low-voltage wiring harness;

[0014] The motor control unit controls the short circuit of the three-phase line unit according to the discharge command sent by the vehicle control unit to achieve high-voltage discharge.

[0015] Furthermore, the motor control unit includes an IGBT device, which is disconnected according to a torque clearing instruction sent by the vehicle controller to cut off the power source of the vehicle.

[0016] Furthermore, the motor control unit also includes a thin film capacitor, and the IGBT device is respectively connected to the thin film capacitor and the three-phase line unit. The IGBT device is closed according to the discharge instruction sent by the vehicle control unit, and the three-phase line unit is short-circuited according to the closed state of the IGBT device to discharge the high voltage of the thin film capacitor.

[0017] Furthermore, the high-pressure relief module also includes:

[0018] The power relay unit is arranged between the vehicle control unit and the motor control unit; the power relay unit is disconnected according to the disconnect relay instruction sent by the vehicle control unit to cut off the power supply of the motor control unit.

[0019] Furthermore, when the voltage of the motor control unit reaches below a preset voltage value, the main control unit inputs a low-level signal to the control unit, and the control unit is disconnected according to the low-level signal to cut off the power supply input of the power supply unit to the gateway control unit.

[0020] Furthermore, a first voltage conversion unit is provided between the power supply unit and the main control unit, and the first voltage conversion unit is used to convert the input voltage of the power supply unit into a first voltage and input it into the main control unit.

[0021] Furthermore, a second voltage conversion unit is connected in series between the second output terminal of the control unit and the gateway control unit, and the second voltage conversion unit is used to convert the input voltage of the power supply unit into a second voltage and input it into the gateway control unit.

[0022] Furthermore, the power relay unit includes a high-voltage distribution box relay and a power battery pack relay connected in series. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a circuit block diagram of a power-down delay module in an embodiment of the present invention;

[0024] Figure 2 A circuit block diagram of a high-voltage discharge module in an embodiment of the present invention;

[0025] Figure 3 This is a circuit diagram of a power-off delay module in an embodiment of the present invention;

[0026] Figure 4 A circuit diagram of a high voltage discharge module in an embodiment of the present invention;

[0027] Description of main structural symbols:

[0028] Power supply unit 10 Vehicle Control Unit 50 Control unit 20 Power relay unit 60 Main control unit 30 Motor Control Unit 70 Gateway Control Unit 40 Three-phase line unit 80 triode Q1 Film capacitors 71

[0029] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0030] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0031] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0033] The power-off control circuit in this embodiment includes a power-off delay module and a high-voltage discharge module. Figure 1 As shown, the power-off delay module in this embodiment includes:

[0034] The power supply unit 10 mainly includes a normal power supply for the vehicle, and is used to supply power to the vehicle after the vehicle is powered off;

[0035] A main control unit 30, one end of which is connected to the power supply unit 10, and is mainly a main control chip of a motor controller MCU;

[0036] The control unit 20 has an input end connected to the other end of the main control unit 30 so as to be turned on and off according to the high and low levels input by the main control unit 30; its first output end is connected to the power supply unit 10, and its second output end is connected to the gateway control unit 40 so as to input the power supply of the power supply unit 10 to the gateway control unit 40.

[0037] Among them, when the main control unit 30 inputs a high-level signal to the input end of the control unit 20, the control unit 20 is closed to control the power supply unit 10 and the gateway control unit 40 to be connected, so that the power supply unit 10 inputs the gateway control unit 40, and realizes the power delay function after the vehicle is powered off. Through the high and low level states of the main control unit 30 and the closing of the control unit 20, the power supply unit 10 is connected to other control units 20 of the vehicle. When the main control unit 30 inputs a low-level signal to the input end of the control unit 20, the control unit 20 is disconnected, the connection between the power supply unit 10 and the gateway control unit 40 is interrupted, and power cannot be provided to the gateway control unit 40, so that the power-off delay is closed.

[0038] like Figure 2 As shown, in this embodiment, in order to improve the safety of the vehicle power-off, a high-voltage discharge module is provided, and the high-voltage discharge module includes:

[0039] The vehicle control unit 50 and the motor control unit 70, the vehicle control unit 50 is connected to the motor control unit 70 via a CAN line;

[0040] The three-phase line unit 80 is connected to the motor control unit 70 via a low-voltage wire harness;

[0041] The power relay unit 60 is provided between the vehicle control unit 50 and the motor control unit 70;

[0042] When the vehicle is powered off, the power-off delay circuit performs delayed power-off processing, and the vehicle control unit 50 sends a discharge instruction to the motor control unit 70 via the CAN line, so that the electrode control unit 20 controls the three-phase unit and the motor control unit 70 to short-circuit according to the discharge instruction, so that the motor control unit 70 is in a high-resistance state, thereby performing high-voltage discharge until the voltage of the motor control unit 70 is lower than the preset voltage value, thereby ensuring the safety of powering off the vehicle.

[0043] like Figure 3As shown, in this embodiment, the power-off delay module includes ON power and normal power B+. When the whole vehicle is powered off, the NO power is disconnected, and the normal power B+ is used to power the whole vehicle, that is, the power supply unit 10. The main control unit 30 is the main control chip MCU, which is responsible for the power-off delay processing of the whole vehicle, otherwise the motor controller will be in a dormant state and cannot meet the use requirements. Pin 1 of the I / O port of the main control chip is connected to the normal power. The control unit 20 includes a transistor Q1, and the gateway control unit 40 includes a CAN transceiver and other chips. The base of the transistor Q1 is connected to the first port of the main control chip, the collector is connected to the normal power, and the emitter is connected to the gateway control unit 40.

[0044] When the vehicle is powered off, pin 2 of the I / O port triggered by the main control chip is at a high level, and transistor Q1 enters a closed state according to the high level input, so that the CAN transceiver and other chips connected to the collector are connected to the emitter, thereby powering the CAN transceiver and other chips.

[0045] Furthermore, a first voltage conversion unit is provided between the permanent power supply and the main control chip, which is used to convert the voltage output by the permanent power supply into the voltage required by the main control chip. A second voltage conversion unit is also provided between the emitter of the transistor Q1 and the gateway control unit 40, and the second conversion unit is used to convert the permanent power supply into the voltage required by the CAN transceiver and other chips and other devices. In this embodiment, the power converted by the first voltage conversion unit is a 5V power supply, and the power converted by the second voltage conversion unit is a 3.3V power supply.

[0046] like Figure 4 As shown, in this embodiment, in the high-voltage discharge module, the vehicle control unit 50 includes a vehicle controller VCU, the motor control unit 70 includes a motor controller, a thin film capacitor 71 and an IGBT device are provided in the motor controller, the vehicle controller and the motor controller are connected via a CAN line, the CAN line includes a CAN-H and a CAN-L line, and the controllers communicate mainly via CAN-H. One end of the motor controller is connected to the high-voltage distribution box through a positive and negative wiring harness to obtain the power source of the power battery pack connected to the other end of the high-voltage distribution box, and the other end is connected to the motor through a low-voltage wiring harness to monitor the number of revolutions of the motor in real time. The power relay unit 60 includes multiple relays of the power battery combination high-voltage distribution box, all of which are connected to the CAN line to achieve communication with the vehicle controller.

[0047] The vehicle controller communicates with the power battery pack, high-voltage distribution box, and motor controller through the CAN line, so that the vehicle controller can control the status of each controller and monitor the information of each controller.

[0048] When the vehicle is in the power-off state, the high voltage discharge of the motor controller is achieved through the following steps.

[0049] Step 1:

[0050] The vehicle controller sends a clear torque command to the motor controller via the CAN line. At this time, the IGBT in the motor controller is disconnected according to the clear torque command to cut off the power source of the vehicle. The motor controller has been monitoring the number of motor revolutions through the low-voltage wiring harness and sending the current number of revolutions signal through the CAN line. By monitoring the number of motor revolutions, it is determined whether the number of motor revolutions after clear torque is zero. When the number of revolutions is greater than 0, passive discharge is performed, and when the number of revolutions is equal to 0, active discharge is performed. When the number of revolutions is judged to be 0, the vehicle controller sends a disconnect relay command via the CAN line, and the high-voltage distribution box responds to the command, disconnects the main positive relay and the auxiliary control relay, thereby disconnecting the power source of the power battery pack.

[0051] Step 2:

[0052] When the power source of the whole vehicle is disconnected, the high voltage of the thin film capacitor 71 inside the electrode controller will be discharged to prevent the high voltage from damaging the circuit. The whole vehicle controller sends a discharge command to the motor controller. The motor controller receives the command message and controls the IGBT device to close. After the IGBT device is closed, the three-phase line will be short-circuited to form a large resistance. The thin film capacitor 71 realizes the internal high-voltage power discharge, thereby improving the safety of the vehicle circuit.

[0053] Step 3:

[0054] When the voltage of the motor controller is discharged to below the human safety voltage of 36V, the high-voltage discharge is completed. When the motor controller completes the discharge, the main control chip triggers the I / O port 2 pin to return to a low level, and the transistor Q1Q1 is disconnected according to the input low-level signal, thereby disconnecting the normal power and the CAN transceiver and other chips for power supply, and the power-off delay is turned off. At the same time, the motor controller controls the IGBT device to disconnect, and the motor controller sends a discharge completion instruction through the CAN line. The vehicle controller receives the instruction through the CAN line, and the vehicle is powered off. By controlling the disconnection timing of each relay and IGBT and other components, the high-voltage discharge of the film capacitor 71 in the motor controller is gradually realized, so that the voltage of the film capacitor 71 is reduced to below the human safety voltage, thereby improving the safety of the vehicle.

[0055] In summary, the vehicle power-off control circuit in the above-mentioned embodiment of the present invention is connected to one end of the main control unit through the control unit in the power-off delay module, and is turned on and off according to the high and low levels of the main control unit to control the power supply connection between the normal power and the gateway control unit. By utilizing the power supply of the entire vehicle, it avoids adding additional circuits to control the delay circuit. At the same time, by utilizing the power supply of the entire vehicle, it avoids connecting to an additional power supply, thereby reducing the difficulty of circuit control and the occurrence of faults.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0057] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A vehicle power-off control circuit, It is characterized in that Including low voltage delay module, power-off delay module includes: A power supply unit and a main control unit, wherein one end of the main control unit is connected to the power supply unit; A control unit, whose input end is connected to the other end of the main control unit to be turned on and off according to the high and low levels input by the main control unit; whose first output end is connected to the power supply unit, and whose second output end is connected to the gateway control unit to input the power supply of the power supply unit to the gateway control unit when the control unit is turned on; The circuit further includes a high-voltage discharge module, and the high-voltage discharge module includes: A vehicle control unit and a motor control unit, wherein the vehicle control unit and the motor control unit are connected via a CAN line; A three-phase line unit connected to the motor control unit via a low-voltage wire harness; The motor control unit controls the three-phase line unit to be short-circuited according to the discharge instruction sent by the vehicle control unit to achieve high-voltage discharge; The control unit includes a transistor, a base of the transistor is connected to the main control unit, an emitter of the transistor is connected to the power supply unit, and a collector of the transistor is connected to the gateway control unit. When the base of the transistor is at a high level, the transistor is turned on to connect the power supply unit to the gateway control unit.

2. The vehicle power-off control circuit according to claim 1, It is characterized in that The motor control unit includes an IGBT device, which is disconnected according to a torque clearing instruction sent by a vehicle controller to cut off the power source of the vehicle.

3. The vehicle power-off control circuit according to claim 2, It is characterized in that The motor control unit also includes a thin film capacitor, and the IGBT device is respectively connected to the thin film capacitor and the three-phase line unit. The IGBT device is closed according to the discharge instruction sent by the vehicle control unit, and the three-phase line unit is short-circuited according to the closed state of the IGBT device to discharge the high voltage of the thin film capacitor.

4. The vehicle power-off control circuit according to claim 3, It is characterized in that The high-voltage discharge module further includes: The power relay unit is arranged between the vehicle control unit and the motor control unit; the power relay unit is disconnected according to the disconnect relay instruction sent by the vehicle control unit to cut off the power supply of the motor control unit.

5. The vehicle power-off control circuit according to claim 1, It is characterized in that When the voltage of the motor control unit reaches below a preset voltage value, the main control unit inputs a low-level signal to the control unit, and the control unit is disconnected according to the low-level signal to cut off the power supply of the power supply unit to the gateway control unit.

6. The vehicle power-off control circuit according to claim 1, It is characterized in that A first voltage conversion unit is further provided between the power supply unit and the main control unit, and the first voltage conversion unit is used for converting the input voltage of the power supply unit into a first voltage and inputting it into the main control unit.

7. The vehicle power-off control circuit according to claim 1, It is characterized in that A second voltage conversion unit is connected in series between the second output terminal of the control unit and the gateway control unit, and the second voltage conversion unit is used for converting the input voltage of the power supply unit into a second voltage and inputting it into the gateway control unit.

8. The vehicle power-off control circuit according to claim 4, It is characterized in that The power relay unit includes a high-voltage distribution box relay and a power battery pack relay connected in series.

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