A vehicle power-on and power-off control method and control system

Abstract

The present invention provides a control method and control system for powering on and off a vehicle, and relates to the field of vehicle engines. The present invention first controls the vehicle to power on when the vehicle receives a trigger command for starting; then controls the vehicle to switch states according to a first preset power-off sequence when receiving a trigger command for normal power-off, so as to complete normal power-off of the vehicle; controls the vehicle to switch states according to a second preset power-off sequence when receiving fault information indicating that the vehicle has failed; controls the vehicle to switch from a current state to a collision initial state or a collision state when receiving collision information indicating that the vehicle has collided, so as to complete emergency power-off of the vehicle. The present invention specifically sets the power-off sequence when the vehicle fails or collides, so as to ensure the safety of the vehicle when it fails or collides.

Description

[0001] This case is a divisional application with application number CN202011401315.9, application date December 4, 2020, and name “A method and control system for controlling vehicle power on and off”. Technical Field

[0002] The present invention relates to the field of vehicle engines, and in particular to a method and a control system for controlling power on and off of a vehicle. Background Art

[0003] At present, the technology of pure electric vehicles (EV), plug-in hybrid electric vehicles (PHEV), and non-plug-in hybrid electric vehicles (HEV) is developing rapidly. Compared with traditional vehicles, the power-on and power-off timing of traditional vehicles is only 12V low voltage, which is harmless to the human body and does not involve the functional safety of the whole vehicle. Pure electric vehicles (EV), plug-in hybrid electric vehicles (PHEV), and non-plug-in hybrid electric vehicles (HEV) are all high-voltage systems above 220V. The power-on and power-off of the high-voltage system is realized by the vehicle controller, and the activation of the driving cycle is based on the control of power-on and power-off. There are a large number of high and low voltage components in hybrid vehicles, such as high-voltage batteries and battery management systems, high-voltage DC-to-low-voltage DC converters (DCDC), air conditioners, body electronic systems, chassis electronic systems, etc. The battery management system, engine controller (ECM), motor controller (IGM), DCDC and other sub-controllers cooperate with the monitoring of the vehicle control module (VCM), combined with the external charging gun and the high voltage safety of the whole vehicle, the whole vehicle needs to control the power-on and power-off timing function to complete the deployment. Therefore, it is necessary to formulate detailed strategies to ensure the rationality and safety of the power-on and power-off process of these components.

[0004] The power-on and power-off sequence of traditional vehicles is only 12V low voltage, which is harmless to the human body and does not involve the functional safety of the whole vehicle. Most of the existing power-on and power-off technologies for high-voltage systems (above 220V) are designed separately for pure electric vehicles (EV), plug-in hybrid vehicles (PHEV), and non-plug-in hybrid vehicles (HEV). There is no power-on and power-off process that is applicable to EV, PHEV, and HEV, and the power-on and power-off sequence of one-button start and remote start is rarely involved. In addition, there are no specific settings for the power-off delay problem when there is a battery cooling or motor cooling request, the active power-off sequence problem when there is a battery failure, DCDC failure, collision, low battery SOC, and an external charging gun during the power-on and power-off process, and the power-on and power-off sequence problem when the vehicle controller is initialized. Summary of the invention

[0005] The first aspect of the present invention aims to provide a method for controlling power on and off of a vehicle, so as to solve the technical problem in the prior art that the power on and off sequence of the vehicle is not fully set, resulting in low vehicle safety.

[0006] A further object of the first aspect of the present invention is to reduce misjudgment of a vehicle collision situation.

[0007] The second aspect of the present invention aims to provide a control system for powering on and off a vehicle.

[0008] According to the purpose of the first aspect of the present invention, the present invention provides a method for controlling power on and off of a vehicle, comprising:

[0009] Controlling the vehicle to power on when the vehicle receives a trigger command to start;

[0010] When a trigger instruction for normal power-off is received, the vehicle is controlled to switch states according to a first preset power-off sequence to complete normal power-off of the vehicle; when fault information indicating that a vehicle fault has occurred is received, the vehicle is controlled to switch states according to a second preset power-off sequence; when collision information indicating that a vehicle collision has occurred is received, the vehicle is controlled to switch from a current state to a collision initial state or a collision state to complete emergency power-off of the vehicle; wherein the first preset power-off sequence is the closed state of the DCDC converter, the closed state of the battery relay, the closed state of the CPSR relay, the open state of the CPSR relay and the initialization state.

[0011] Optionally, the step of controlling the vehicle to power on when the vehicle receives a trigger instruction to start is specifically:

[0012] When the vehicle receives a start trigger command, the vehicle is controlled to switch states according to a preset power-on sequence to complete vehicle power-on, wherein the preset power-on sequence is initialization state, CPSR relay closed state, CPSR relay open state, CPSR relay closed state, battery relay closed state and DCDC converter closed state.

[0013] Optionally, the step of controlling the vehicle to switch states according to a second preset power-off sequence when fault information indicating that a fault has occurred in the vehicle is received specifically includes:

[0014] The vehicle is controlled to eventually switch from the current state to the CPSR relay closed state to complete the emergency power-off of the vehicle, wherein the first preset power-off sequence is the DCDC converter closed state, the battery relay closed state, and the CPSR relay closed state.

[0015] Optionally, the fault information includes at least one of a high voltage battery fault, an OBC controller fault and a DCDC converter fault.

[0016] Optionally, when receiving collision information indicating that the vehicle has collided, the step of controlling the vehicle to switch from a current state to a collision initial state or a collision state specifically includes:

[0017] When the vehicle has power output, control the vehicle to switch from the current state to the collision initial state;

[0018] After a first preset time has passed, determining whether the vehicle meets a preset collision condition;

[0019] If so, the vehicle is controlled to switch from the collision initial state to the collision state, wherein the collision state is that the CPSR relay is disconnected, the battery relay is disconnected, and the DCDC converter is disconnected.

[0020] Optionally, the step of controlling the vehicle to switch from a current state to a collision initial state or a collision state upon receiving collision information indicating that the vehicle has collided, further includes:

[0021] When the vehicle has no power output, controlling the vehicle to switch from the current state to the collision state;

[0022] After the first preset time has passed, determining whether the vehicle meets the preset collision condition;

[0023] If so, the vehicle is controlled to maintain in the collision state.

[0024] Optionally, if there is a cooling request for the vehicle during the vehicle power-off process, the temperature of the cooling system is detected;

[0025] If the temperature of the cooling system is higher than the preset temperature, maintaining the cooling system to continue operating until the temperature of the cooling system is no higher than the preset temperature;

[0026] The vehicle is controlled to switch to the battery relay closed state.

[0027] Optionally, after the step of controlling the vehicle to power on when the vehicle receives a trigger instruction to start, the method further includes:

[0028] When the vehicle controller of the vehicle is initialized, the vehicle is controlled to switch from the current state to the initialized state, and after the vehicle controller completes the initialization, the vehicle is controlled to be powered on again to the state before the initialization.

[0029] Optionally, when the vehicle has no power output and is in a state of being charged by an external charging gun, the vehicle is controlled to switch from the current state to the CPSR relay closed state according to the first preset power-off sequence, or the vehicle is controlled to switch from the current state to the CPSR relay closed state according to the preset power-on sequence.

[0030] According to the purpose of the second aspect of the present invention, the present invention also provides a vehicle power-on and power-off control system, comprising:

[0031] A control module, the control module includes a memory and a processor, the memory stores a calculation program, and the calculation program is used to implement the above-mentioned control method when executed by the processor.

[0032] The present invention first controls the vehicle to power on when the vehicle receives a trigger command for starting; then controls the vehicle to switch states according to a first preset power-off sequence when receiving a trigger command for normal power-off, so as to complete normal power-off of the vehicle; controls the vehicle to switch states according to a second preset power-off sequence when receiving fault information indicating that the vehicle has failed; controls the vehicle to switch from the current state to a collision initial state or a collision state when receiving collision information indicating that the vehicle has collided, so as to complete emergency power-off of the vehicle; wherein the first preset power-off sequence is a DCDC converter closed state, a battery relay closed state, a CPSR relay closed state, a CPSR relay disconnected state, and an initialization state. The present invention specifically sets the power-off sequence when the vehicle fails or collides, so as to ensure the safety of the vehicle when it fails or collides.

[0033] Furthermore, the present invention controls the vehicle to switch from the current state to the collision initial state when the vehicle has power output, and then determines whether the vehicle meets the preset collision condition after a first preset time. If so, the vehicle is controlled to switch from the collision initial state to the collision state, and the collision state is that the CPSR relay is disconnected, the battery relay is disconnected, and the DCDC converter is disconnected. When the vehicle has power output, the present invention needs to wait for a certain period of time before determining whether to switch to the collision state, thereby reducing the misjudgment of the vehicle collision situation.

[0034] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0036] Figure 1 is a schematic flow chart of a method for controlling power on and off of a vehicle according to an embodiment of the present invention;

[0037] Figure 2 is a schematic flow chart of a method for controlling power on and off of a vehicle according to another embodiment of the present invention;

[0038] Figure 3 is a schematic flow chart of a method for controlling power on and off of a vehicle according to yet another embodiment of the present invention;

[0039] Figure 4 is a schematic switching diagram of switching between power-on and power-off states of a vehicle according to the present invention;

[0040] Figure 5 It is a schematic structural diagram of a vehicle power-on and power-off control system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0041] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0042] Figure 1 FIG. 1 is a schematic flow chart of a method for controlling vehicle power on and off according to an embodiment of the present invention. Figure 1 As shown, in a specific embodiment, the method for controlling power on and off of a vehicle specifically includes the following steps:

[0043] S100, controlling the vehicle to power on when the vehicle receives a trigger command to start;

[0044] S210, upon receiving a normal power-off trigger instruction, controlling the vehicle to switch states according to a first preset power-off sequence to complete normal power-off of the vehicle; wherein the first preset power-off sequence is a DCDC converter closed state, a battery relay closed state, a CPSR relay closed state, a CPSR relay open state, and an initialization state;

[0045] S220, upon receiving fault information indicating that a fault has occurred in the vehicle, controlling the vehicle to switch states according to a first preset power-off sequence to complete emergency power-off of the vehicle;

[0046] S230, upon receiving collision information indicating that a collision has occurred in the vehicle, controlling the vehicle to switch from a current state to a collision initial state or a collision state, so as to complete emergency power-off of the vehicle.

[0047] Here, there is no sequential relationship between S210, S220 and S230. The CPSR relay is a switch for supplying 12V power to the motor controller and the battery controller. When the CPSR relay is closed, power can be supplied, and when the CPSR relay is closed, power cannot be supplied.

[0048] The vehicle power-on and power-off control method provided by the present invention is applicable to pure electric vehicles (EV), plug-in hybrid electric vehicles (PHEV) and non-plug-in hybrid electric vehicles (HEV). The present invention specifically sets the power-off sequence when the vehicle fails or collides, thereby ensuring the safety of the vehicle when a failure or collision occurs.

[0049] Further, when the vehicle receives a trigger command to start, step S100 of controlling the vehicle to power on is specifically as follows:

[0050] When the vehicle receives a start trigger command, the vehicle is controlled to switch states according to a preset power-on sequence to complete vehicle power-on, wherein the preset power-on sequence is initialization state, CPSR relay closed state, CPSR relay open state, CPSR relay closed state, battery relay closed state and DCDC converter closed state.

[0051] Furthermore, the switching between the initialization state (hereinafter referred to as state 1), CPSR relay disconnection state (hereinafter referred to as state 2), CPSR relay closing state (hereinafter referred to as state 3), battery relay closing state (hereinafter referred to as state 4) and DCDC converter closing state (hereinafter referred to as state 5) requires the acquisition of relevant signals, such as input key state, ignition switch state, charging gun state (not considered for non-plug-in hybrid vehicles), battery management system (BMS) state, DCDC converter state, CPSR relay state, etc. The vehicle controller uses the above signals as the basis for judgment, judges and switches the state transfer conditions, and can realize the power-on and power-off timing control of the vehicle. The state switching between the collision initial state (hereinafter referred to as state 6) and the collision state (hereinafter referred to as state 7) also requires the acquisition of relevant collision information.

[0052] Specifically, the normal power-on without any impact follows the following sequence:

[0053] ①. The key is unlocked and the vehicle controller is initialized;

[0054] ②.Before the vehicle controller is initialized, the actual state of the battery relay is disconnected. After one operation cycle, it will automatically enter the CPSR relay closed state;

[0055] ③. Since the driver did not press the ignition switch and the actual state of the battery relay was disconnected, the CPSR relay would automatically enter the disconnected state after one operation cycle;

[0056] ④. Press and hold the ignition switch button for about 5-6 seconds, and the CPSR relay closes;

[0057] ⑤. Step on the brake and press the ignition switch button at the same time to request the battery relay to close;

[0058] ⑥. After the battery relay is actually closed, request the DCDC converter to close.

[0059] The normal power-off sequence without any impact is as follows:

[0060] ①. When the driver presses the start on / off button, wait for power off;

[0061] ②. When the vehicle speed is lower than the preset threshold and there is no electric drive cooling request or high-voltage cooling demand, it can be determined that the vehicle meets the power-off conditions and the DCDC converter is requested to be disconnected;

[0062] ③. The high voltage current is 0, requesting the battery relay to be disconnected;

[0063] ④. After the battery relay is disconnected, request the CPSR relay to be disconnected;

[0064] ⑤.Power off the vehicle controller.

[0065] That is to say, the normal power-on sequence is: state 1 → state 3 → state 2 → state 3 → state 4 → state 5; the normal power-off sequence is: state 5 → state 4 → state 3 → state 2 → state 1. The above is the power-on and power-off sequence during normal driving of the vehicle. When the driver's operation changes, the vehicle state will switch according to his intention. The preset threshold here can be set to 0.1km / h.

[0066] Specifically, the driver performs one-button start power-on in the following order:

[0067] ①. Unlock the key and initialize the vehicle controller;

[0068] ②.Before the vehicle controller is initialized, the actual state of the battery relay is disconnected. After one operation cycle, it will automatically enter the CPSR relay closed state;

[0069] ③. Since the driver did not press the ignition switch and the actual state of the battery relay was disconnected, the CPSR relay would automatically enter the disconnected state after one operation cycle;

[0070] ④. Step on the brake and press the ignition switch button, the ignition switch turns on and the CPSR relay closes;

[0071] ⑤.After the CPSR relay is closed, directly request the battery relay to be closed;

[0072] ⑥. After the battery relay is actually closed, request the DCDC converter to close.

[0073] The driver performs one-button start to power off in the following order:

[0074] ①. When the driver presses the ignition button, wait for power to be turned off;

[0075] ②. When the vehicle speed is lower than the preset threshold and there is no electric drive cooling request or high-voltage cooling demand, it can be determined that the vehicle meets the power-off conditions and the DCDC converter is requested to be disconnected;

[0076] ③. The high voltage current is 0, requesting the battery relay to be disconnected;

[0077] ④. After the battery relay is disconnected, request the CPSR relay to be disconnected;

[0078] ⑤.Power off the vehicle controller.

[0079] The power-on sequence of one-key start is: state 1 → state 3 → state 2 → state 3 → state 4 → state 5. The power-off sequence of one-key start is: state 5 → state 4 → state 3 → state 2 → state 1. The above is the timing operation of one-key start. From the timing, it can be seen that the timing is the same as the timing of normal power-on. When powering on, the steps of state 2 → state 3 → state 4 save a lot of time. The normal power-on process takes 5.6s, while the one-key start power-on process is about 0.8s.

[0080] Specifically, the remote start power-on sequence is as follows:

[0081] ①. Unlock the key and initialize the vehicle controller;

[0082] ②.Before the vehicle controller is initialized, the actual state of the battery relay is disconnected. After one operation cycle, it will automatically enter the CPSR relay closed state;

[0083] ③. Since the driver did not press the ignition switch and the actual state of the battery relay was disconnected, the CPSR relay would automatically enter the disconnected state after one operation cycle;

[0084] ④. Press the remote start button on the key, the ignition switch turns on immediately, and the CPSR relay engages;

[0085] ⑤.After the CPSR relay is closed, directly request the battery relay to be closed;

[0086] ⑥. After the actual state of the battery relay is connected, request the DCDC converter to connect.

[0087] The power-on sequence for remote start is as follows:

[0088] ①. The driver presses the ignition switch and waits for the power to be turned off;

[0089] ②. When the vehicle speed is lower than the preset threshold and there is no electric drive cooling request or high-voltage cooling demand, it can be determined that the vehicle meets the power-off conditions and the DCDC converter is requested to be disconnected;

[0090] ③. The high voltage current is 0, requesting the battery relay to be disconnected;

[0091] ④. After the battery relay is disconnected, request the CPSR relay to be disconnected;

[0092] ⑤.Power off the vehicle controller.

[0093] That is to say, the power-on sequence of remote startup is: state 1 → state 3 → state 2 → state 3 → state 4 → state 5. The power-off sequence of remote startup is: state 5 → state 4 → state 3 → state 2 → state 1. From the timing sequence, it can be seen that the remote timing sequence is the same as the normal power-on timing sequence.

[0094] Further, step S310 of controlling the vehicle to switch states according to a first preset power-off sequence according to the fault information specifically includes:

[0095] The vehicle is controlled to switch from the current state to the CPSR relay closed state to complete the emergency power-off of the vehicle, wherein the first preset power-off sequence is the DCDC converter closed state, the battery relay closed state and the CPSR relay closed state. The fault information includes at least one of a high-voltage battery fault, an OBC controller fault and a DCDC converter fault.

[0096] Specifically, when the high-voltage battery fails, the system will automatically shut down the battery for safety reasons. If the battery is currently in state 5, the system will automatically shut down the battery from high voltage to low voltage in the order of state 5 → state 4 → state 3. If the driver presses the ignition switch again, the system will automatically shut down the battery from state 3 → state 2 → state 1. If the battery is currently in state 4, the system will shut down the battery from state 4 → state 3, and the system will automatically shut down the battery from high voltage to low voltage. If the driver presses the ignition switch again, the system will automatically shut down the battery from state 3 → state 2 → state 1.

[0097] When the OBC controller fails, it will be powered off for safety reasons. If it is currently in state 5, it will be powered off in the order of state 5 → state 4 → state 3, and then from state 3 → state 2 → state 1. If it is currently in state 4, it will be powered off in the order of state 4 → state 3, and then from high pressure state to low pressure state. If the driver presses the ignition switch again, it will be powered off in the order of state 3 → state 2 → state 1.

[0098] When the DCDC converter fails, it will be powered off automatically. If it is currently in state 5, it will be powered off in the order of state 5 → state 4 → state 3. If it is currently in state 4, it will be powered off in the order of state 4 → state 3.

[0099] Furthermore, if the battery SOC is very low (less than 20%), the system will automatically power off the battery to protect it. If the system is currently in state 5, the system will automatically power off the battery from high voltage to low voltage in the order of state 5 → state 4 → state 3. If the driver presses the ignition switch again, the system will power off the battery from state 3 → state 2 → state 1. If the system is currently in state 4, the system will power off the battery from state 4 → state 3, and the system will automatically power off the battery from high voltage to low voltage. If the driver presses the ignition switch again, the system will power off the battery from state 3 → state 2 → state 1.

[0100] Figure 2 FIG. 1 is a schematic flow chart of a method for controlling vehicle power on and off according to another embodiment of the present invention. Figure 2 As shown, and see Figure 1 In another embodiment, when receiving collision information indicating that the vehicle has collided, step S230 of controlling the vehicle to switch from the current state to the collision initial state or the collision state specifically includes the following steps:

[0101] S231, controlling the vehicle to switch from a current state to a collision initial state when the vehicle has power output;

[0102] S232, after a first preset time, determine whether the vehicle meets a preset collision condition; if so, execute step S233;

[0103] S233, controlling the vehicle to switch from the collision initial state to the collision state, the collision state is that the CPSR relay is disconnected, the battery relay is disconnected, and the DCDC converter is disconnected.

[0104] Further, the step S230 of controlling the vehicle to switch from the current state to the collision initial state or the collision state upon receiving the collision information indicating that the vehicle has collided, further includes the following steps:

[0105] Step 1: When the vehicle has no power output, control the vehicle to switch from the current state to the collision state;

[0106] Step 2: After a first preset time has passed, determine whether the vehicle meets a preset collision condition; if so, execute step 3;

[0107] Step 3: Control the vehicle to maintain a collision state.

[0108] That is to say, when a collision occurs when the vehicle is in a high-pressure state, it will first switch from the current state to the collision initial state, and after a certain period of time, it will be confirmed again whether the collision conditions are met. If they are met, the vehicle will be controlled to switch to the collision state. If the collision conditions are not met, the vehicle will be controlled to switch to the state before the collision initial state. The present invention will determine whether to switch to the collision state after a certain period of time when the vehicle has power output, thereby reducing the misjudgment of the vehicle collision situation.

[0109] Furthermore, when a collision occurs while the vehicle is in a low-pressure state, the vehicle will be directly controlled to enter a collision state. If the preset collision conditions are not met, the vehicle will be controlled to switch from the current collision state to the CPSR relay disconnected state (state 2).

[0110] Figure 3 FIG. 1 is a schematic flow chart of a method for controlling vehicle power on and off according to another embodiment of the present invention. Figure 3 As shown, in another embodiment, the method for controlling power on and off of a vehicle further includes the following steps:

[0111] S241, during the process of the vehicle being powered off, determining whether the vehicle has a cooling request; if so, executing S342;

[0112] S242, detecting the temperature S of the cooling system;

[0113] S243, determining whether the temperature of the cooling system is higher than the preset temperature S1; if so, repeating S243; if not, executing S244;

[0114] S244, controlling the vehicle to switch to a battery relay closed state.

[0115] That is, when the temperature of the vehicle cooling system is higher than the preset temperature S1 , the cooling system is maintained to continue operating until the temperature of the cooling system is no higher than the preset temperature S1 .

[0116] Furthermore, if the battery has a heat dissipation request (for example, the ambient temperature suddenly rises to 40 degrees), it will actively request power-on for thermal management considerations. After the vehicle is initialized, the vehicle controller will actively send a cooling request to power on, and power on through the power-on sequence of state 1 → state 2 → state 3 → state 4 → state 5 to cool the battery.

[0117] Further, after the step S100 of controlling the vehicle to power on when the vehicle receives the trigger command to start, the method further includes:

[0118] When the vehicle controller of the vehicle is initialized, the vehicle is controlled to switch from the current state to the initialization state, and after the vehicle controller completes the initialization, the vehicle is controlled to be powered on again to the state before initialization.

[0119] Specifically, when the vehicle controller is initialized, the power control must maintain the state before initialization for safety and to prevent power loss. If the current state is 5, the vehicle controller is initialized, and the state switching sequence is state 5→state 1→state 4→state 5; if the current state is 4, the vehicle controller is initialized, and the state switching sequence is state 4→state 1→state 4; if the current state is 3, the vehicle controller is initialized, and the state switching sequence is state 3→state 1→state 3; if the current state is 2, the vehicle controller is initialized, and the state switching sequence is state 2→state 1→state 3→state 2.

[0120] That is, if the battery relay is currently in a closed state, the vehicle controller will still request the battery relay to be closed after initialization to avoid power loss; if the battery relay is currently in a disconnected state, the vehicle controller will still request the battery relay to be disconnected after initialization.

[0121] Furthermore, the vehicle power-on and power-off control method further includes:

[0122] When the vehicle has no power output and is in the state of being charged by an external charging gun, the vehicle is controlled to switch from the current state to the CPSR relay closed state according to the first preset power-off sequence, or the vehicle is controlled to switch from the current state to the CPSR relay closed state according to the preset power-on sequence.

[0123] Specifically, when the charging port is opened, the instrument prompts that the charging gun cannot be inserted under high voltage. When the OBC charging gun is inserted, the battery controller needs to be powered on to monitor the battery power SOC and battery temperature. If the charging gun is inserted under high voltage by mistake, the power will be actively powered off. If it is currently in state 5, it will be actively powered off, and the power-off sequence is state 5→state 4→state 3; if it is currently in state 4, it will be actively powered off, and the power-off sequence is state 4→state 3; if it is in state 3, keep the current state unchanged; if it is in state 2, it will actively request the CPSR relay to power on, detect the battery power SOC and battery temperature, and the power-on sequence is state 2→state 3. If it is currently in state 1, it will actively request the CPSR relay to power on, and the power-on sequence is state 1→state 3.

[0124] Furthermore, when the vehicle is in a low voltage state, the battery relay disconnection triggers the power-off request to state 2. The recommended delay time is 900s. When the vehicle is in a low voltage state, the OBC reports an error or the DCDC is not activated. The recommended delay time is 900s. When the vehicle is in a low voltage state, the external power is cut off or the OBC is offline. The recommended delay time is 3600s.

[0125] Specifically, among the seven states in the present invention, each state corresponds to the following three flags: requesting CPSR relay state, requesting battery relay state, and DCDC converter state output.

[0126] (1) State 1: Initialization state, the vehicle controller is in the awake state, and the three flag bits request states are as follows:

[0127] The CPSR relay requests to be closed; the battery relay requests to remain consistent with the state before initialization; and the DCDC converter requests to be disconnected.

[0128] (2) State 2: CPSR relay off: If the ignition switch is not turned on after waking up, this state is entered. The three flag bits request the following states:

[0129] The CPSR relay requests to be disconnected; the battery relay requests to be disconnected; the DCDC converter requests to be disconnected.

[0130] (3) State 3: CPSR relay closed (relay active), the state corresponding to the driver turning on the ignition switch, the three flag bit request states are as follows:

[0131] The CPSR relay requests to be closed; the battery relay requests to be opened; and the DCDC converter requests to be opened.

[0132] (4) State 4: Battery relay request to close (HV_contactor close), the three flag bits request states are as follows:

[0133] The CPSR relay requests to be closed; the battery relay requests to be closed; the DCDC converter requests to be opened.

[0134] (5) State 5: DCDC converter closed (HV enable), the three flag bits request states are as follows:

[0135] The CPSR relay requests to be closed; the battery relay requests to be closed; the DCDC converter requests to be closed.

[0136] (6) State 6: Initial collision state (PreCrash), a collision occurs under high pressure state, and the three flag bits request states are as follows:

[0137] The CPSR relay requests to be closed; the battery relay requests to be closed; the DCDC converter requests to be opened.

[0138] (7) State 7: Crash state. A collision occurs in the low-pressure state. The three flag bits request states as follows:

[0139] The CPSR relay requests to be disconnected; the battery relay requests to be disconnected; the DCDC converter requests to be disconnected.

[0140] Figure 4 Schematic diagram of the switching of the vehicle power-on and power-off states according to the present invention. Figure 4 As shown in the figure, the vehicle power-on and power-off state switching conditions are as follows:

[0141] Condition T01: When the vehicle controller is initialized while the battery relay is in the disconnected state, it will go from state 1 to state 3.

[0142] Condition T02: The following conditions are met simultaneously: there is a driver start request, a remote start request, or a high-voltage battery cooling request, the battery has no faults, the battery SOC is higher than the preset threshold (25%), the DCDC converter has no faults, and the battery relay request state and actual state are both closed.

[0143] There is another situation: when the battery relay is closed, the vehicle controller is initialized and it will also go from state 4 to state 5.

[0144] Condition T03: The ignition switch is turned on or the following conditions are met at the same time: there is a driver start request or a remote start request or a high-voltage battery cooling request or an OBC charging request, the battery has no faults, the battery power SOC is higher than the preset threshold (25%), and the DCDC converter has no faults.

[0145] Condition T04: The battery relay is disconnected and any of the following conditions are met: the vehicle speed is lower than the threshold and the driver turns off the ignition switch. At the same time, when there is no electric drive cooling demand or high-voltage cooling demand, the vehicle can be judged to meet the power-off conditions; when the external power supply is cut off during external charging, the OBC fails, or the DCDC converter or high-voltage battery control is abnormal, the vehicle will be powered off actively; if the DCDC converter response is not activated during the startup process, the power will be turned off actively; if the battery system fails, the power should be turned off actively; if the DCDC converter fails, the power should be turned off actively; when the battery SOC is very low (less than 20%), the power should be turned off actively.

[0146] Condition T05: The vehicle collides under high pressure and enters the initial collision state.

[0147] Condition T06: The vehicle collides in a low-pressure state and enters a collision state.

[0148] Condition T07: The preset collision condition is not met.

[0149] Condition T08: Request the initial collision state to be delayed for a certain period of time to confirm that the preset collision conditions are met.

[0150] Condition T09: The following conditions are met simultaneously: there is a driver start request, a remote start request, or a high-voltage battery cooling request, the battery has no faults, the battery power SOC is higher than the threshold (25%), and the DCDC converter has no faults.

[0151] There is also a special case: when the battery relay is closed and the vehicle controller is initialized, it will also go from state 3 to state 4.

[0152] Condition T10: If any of the following conditions is met: the vehicle speed is lower than the preset threshold and the driver turns off the ignition switch, and there is no electric drive cooling demand or high-voltage cooling demand, the vehicle can be judged to meet the power-off conditions; the vehicle will be actively powered off when an OBC fault occurs or the DCDC converter or high-voltage battery control is abnormal; if the DCDC converter response is not activated during the startup process, the power will be powered off; if the battery system fails, the power should be actively powered off; if the DCDC converter fails, the power should be actively powered off; if the battery SOC is very low (20%), the power should be actively powered off.

[0153] Condition T11: Any of the following conditions is met and the high-voltage current is 0 at the same time: the vehicle speed is lower than the preset threshold and the driver turns off the ignition switch. At the same time, when there is no electric drive cooling demand or high-voltage cooling demand, it can be determined that the vehicle meets the power-off conditions; when an OBC fault state occurs or the DCDC converter or high-voltage battery control is abnormal, the power will be automatically cut off; if the DCDC converter response is not activated during the startup process, the power will be cut off; if the battery system fails, the power should be automatically cut off; if the DCDC converter fails, the power should be automatically cut off; when the battery SOC is very low (less than 20%), the power should be automatically cut off.

[0154] Condition T12: When the battery relay is closed, the vehicle controller is initialized and it will also go from state 1 to state 4.

[0155] Figure 4 FIG. 1 is a schematic structural diagram of a vehicle power-on and power-off control system 100 according to an embodiment of the present invention. Figure 4As shown, in a specific embodiment, the control system 100 for powering on and off the vehicle includes a control module 20, and the control module 10 includes a memory 11 and a processor 12. The memory 11 stores a computing program, and the computing program is used to implement the control method in any of the above embodiments when executed by the processor 12. The processor 12 can be a central processing unit (CPU), or a digital processing unit, etc. The processor 12 sends and receives data through a communication interface. The memory 11 is used to store the program executed by the processor 12. The memory 11 is any medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, and can also be a combination of multiple memories 11. The above computing program can be downloaded from a computer-readable storage medium to a corresponding computing / processing device or downloaded to a computer or an external storage device via a network (such as the Internet, a local area network, a wide area network and / or a wireless network). The control module 10 here includes an engine controller.

[0156] The present invention further provides a vehicle, which is equipped with the above-mentioned vehicle power-on and power-off control system 100. The control system 100 is not described in detail here.

[0157] The present invention not only formulates the normal power-on and power-off sequence process, but also formulates the fast one-button start power-on and power-off process, formulates the power-off process when the OBC controller, DCDC converter and high-voltage battery fail, formulates the power-off process when the vehicle collides in the high-voltage state and when the vehicle collides in the low-voltage state, formulates the power-off process when there is a cooling demand in the thermal management system, such as the electric drive cooling demand and the high-voltage cooling demand, formulates the power-off process when the vehicle controller is initialized during the operation of the vehicle, formulates the power-off process when the battery power is very low, formulates the power-on and power-off process when the battery has a heat dissipation demand, and formulates how to control the vehicle to power on and off when an external charging gun is plugged in. The present invention comprehensively considers various situations of the vehicle, can ensure the safety of the vehicle and the various components in the vehicle are not damaged, and can extend the service life of each component.

[0158] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived based on the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all these other variations or modifications.

Claims

1. A method for controlling power on and off of a vehicle, characterized in that: include: Controlling the vehicle to power on when the vehicle receives a trigger command to start; Upon receiving a normal power-off trigger instruction, the vehicle is controlled to switch states according to a first preset power-off sequence to complete normal power-off of the vehicle; upon receiving fault information indicating that a vehicle fault has occurred, the vehicle is controlled to switch states according to a second preset power-off sequence; upon receiving collision information indicating that a vehicle collision has occurred, the vehicle is controlled to switch from a current state to a collision initial state or a collision state to complete emergency power-off of the vehicle; wherein the first preset power-off sequence is a DCDC converter closed state, a battery relay closed state, a CPSR relay closed state, a CPSR relay disconnected state, and an initialization state; The step of controlling the vehicle to switch from a current state to a collision initial state or a collision state upon receiving collision information indicating that the vehicle has collided includes: When the vehicle has no power output, controlling the vehicle to switch from the current state to the collision state; After a first preset time has passed, determining whether the vehicle meets a preset collision condition; If so, the vehicle is controlled to maintain in the collision state, where the CPSR relay is turned off, the battery relay is turned off, and the DCDC converter is turned off.

2. The control method according to claim 1, characterized in that: The steps of controlling the vehicle to power on when the vehicle receives a trigger command to start are as follows: When the vehicle receives a start trigger command, the vehicle is controlled to switch states according to a preset power-on sequence to complete vehicle power-on, wherein the preset power-on sequence is initialization state, CPSR relay closed state, CPSR relay open state, CPSR relay closed state, battery relay closed state and DCDC converter closed state.

3. The control method according to claim 1, characterized in that: The step of controlling the vehicle to switch states according to a second preset power-off sequence upon receiving fault information indicating that a fault has occurred in the vehicle specifically includes: The vehicle is controlled to eventually switch from the current state to the CPSR relay closed state to complete the emergency power-off of the vehicle, wherein the second preset power-off sequence is the DCDC converter closed state, the battery relay closed state, and the CPSR relay closed state.

4. The control method according to claim 3, characterized in that: The fault information includes at least one of a high voltage battery fault, an OBC controller fault, and a DCDC converter fault.

5. The control method according to claim 1, characterized in that: The step of controlling the vehicle to switch from a current state to a collision initial state or a collision state upon receiving collision information indicating that the vehicle has collided, further includes: When the vehicle has power output, controlling the vehicle to switch from the current state to the collision initial state; After the first preset time has passed, determining whether the vehicle meets the preset collision condition; If so, controlling the vehicle to switch from the collision initial state to the collision state; After the step of controlling the vehicle to power on when the vehicle receives a trigger instruction to start, the method further includes: When the vehicle controller of the vehicle is initialized, the vehicle is controlled to switch from the current state to the initialized state, and after the vehicle controller completes the initialization, the vehicle is controlled to be powered on again to the state before the initialization.

6. The control method according to claim 1, characterized in that: If there is a cooling request for the vehicle during the vehicle power-off process, the temperature of the cooling system is detected; If the temperature of the cooling system is higher than the preset temperature, maintaining the cooling system to continue operating until the temperature of the cooling system is no higher than the preset temperature; The vehicle is controlled to switch to the battery relay closed state.

7. The control method according to claim 2, characterized in that: When the vehicle has no power output and is in a charging state with an external charging gun, the vehicle is controlled to switch from the current state to the CPSR relay closed state according to the first preset power-off sequence, or the vehicle is controlled to switch from the current state to the CPSR relay closed state according to the preset power-on sequence.

8. A vehicle power-on and power-off control system, characterized in that: include: A control module, the control module comprising a memory and a processor, the memory storing a calculation program, and the calculation program, when executed by the processor, is used to implement the control method according to any one of claims 1-7.

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