CN115923514A - Vehicle high-voltage power-on and power-off control method - Google Patents
Vehicle high-voltage power-on and power-off control method Download PDFInfo
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Abstract
The invention is suitable for the technical improvement field of high-voltage power supply, and provides a control method for high-voltage power supply and discharge of a vehicle, which comprises the following steps of S1, judging which gear the PEPS key is in; and S2, controlling the high-voltage power on and off of the vehicle according to the judgment result of the gear so that the whole vehicle is in a running state or a dormant state. The battery pre-charging system has the functions that under the condition that the battery is short-circuited or close to short-circuited as a circuit, a main positive contactor of the battery cannot be closed, an MSD switch of a protection circuit is prevented from being burnt, and the safety of the battery is protected; the whole vehicle pre-charging system provides power-on and power-off logic control for the high-voltage working condition of the electric vehicle, and the reliability and safety of the high-voltage power-on and power-off control are guaranteed; the difference with the existing whole vehicle electronic and electric architecture is not great; no independent control module is provided, so that the cost is reduced; the multiple control modules work in a matched mode, and safety is improved.
Description
Technical Field
The invention belongs to the field of improvement of high-voltage power supply technology, and particularly relates to a control method for high-voltage power on and off of a vehicle.
Background
In recent years, under the strong supporting encouragement of national relevant policies, more and more host plants develop new energy vehicles, including hybrid vehicles, and put the new energy vehicles into the market. The theme of 'energy conservation, consumption reduction and environmental protection' in the sustainable development trend is paid attention to by people, more and more people begin to choose hybrid electric vehicles, so that the market quantity of the hybrid electric vehicles is continuously increased, and various high-voltage safety problem accidents of the hybrid electric vehicles also occur. At present, the power-on and power-off control of an electric automobile mainly has two modes, one mode is that a high-voltage main controller is added inside a power battery, and the other mode is that the main controller is added outside the power battery.
Disclosure of Invention
The invention aims to provide a vehicle high-voltage power-on and power-off control method, and aims to solve the technical problem.
The invention is realized in such a way, and provides a vehicle high-voltage power-on and power-off control method, which comprises the following steps:
s1, judging which gear the PEPS key gear is in;
and S2, controlling the high-voltage power on and off of the vehicle according to the judgment result of the gear so that the whole vehicle is in a running state or a dormant state.
The invention further adopts the technical scheme that: the PEPS key in the step S1 is in two gears, namely an ON gear and an IG Off/Acc gear, or the whole vehicle has a high-voltage failure.
The invention further adopts the technical scheme that: when the PEPS key is switched to the ON gear, the vehicle is electrified under high voltage, and the method comprises the following steps:
SS11, judging whether the whole vehicle has no power-off fault, whether a key is used for starting a start gear and whether the anti-theft authentication is passed, if so, executing the next step, and if not, returning to the HCU power-on self-test of the whole vehicle controller;
SS12, judging whether the gear is in an N gear/P gear, if so, sending a battery high-voltage electrifying request as a 'closed high-voltage switch', sending a 'closed high-voltage request' to the BMS by the HCU, and if not, returning to the step SS1;
SS13, judging whether the BMS pre-charging is in a failure state; if yes, executing the next step, otherwise, returning to the step SS1;
and SS14, judging whether the high-voltage fault is not broken, if so, executing the next step, and if not, abandoning.
The method comprises the following steps of SS15, sending a running mode of the whole vehicle to be powered on, sending an AC working mode request to be standby, sending a DCDC working mode to be S1= Buck (12V output electric energy) and sending a high-voltage connection state of the vehicle to an instrument;
SS16, setting 'driving preparation' in the whole vehicle working mode, sending the running preparation state of the whole vehicle to the instrument as 'READY' and entering the running state of the whole vehicle.
The further technical scheme of the invention is as follows: the vehicle high-voltage power-on further comprises a self-checking step;
SS21, initializing BMS first power-ON work in a key to ON gear system;
SS22, judging whether the BMS completes self-checking and fault detection, if so, judging that the BMS receives a high-voltage power-on request as 'closing a high-voltage switch', and if not, returning to the step SS21;
SS23, BMS close the preliminary filling relay, main negative relay, main positive relay and clear the counter sequentially separately, and count and close main negative, preliminary filling switch number of times N1;
SS24 and BMS judge whether the voltage difference between the external voltage of the battery pack and the internal voltage of the battery end is 8V, if yes, the next step is executed, and if not, the step SS21 is returned;
SS25, judging that the voltage difference between the inside and the outside of the battery pack is less than or equal to 8V within 1500ms, if so, closing a main positive relay of the battery system by the BMS, delaying and disconnecting a pre-charging relay, and sending the high-voltage output state of the battery pack to be HV poweron.
The further technical scheme of the invention is as follows: when the PEPS key is turned to IG Off/Acc or the whole vehicle has a high-voltage failure, the vehicle is powered Off under high voltage, and the method comprises the following steps:
SX11, judging whether the vehicle speed is lower than a threshold value, whether the rotating speed of a motor is lower than 50rpm, whether the torque of the motor is lower than the threshold value and whether the engine is stopped, if so, sending a 'finished vehicle running mode = power-off/fault' to a motor working state request = 'forbid', a motor torque request = '0' and stopping the engine by the HCU, and if not, returning to the step SX11;
and (4) SX12, shutting down the high-voltage component and judging whether the BMS is disconnected with high voltage or not, if so, sending a motor active discharge request to the GCU/MCU by the HCU, timing 8s jewel network communication according to network management specifications, and sleeping after a low-voltage point is reached.
The further technical scheme of the invention is as follows: the step SX12 further includes the following steps:
SX121, determining whether the current of the battery pack is less than or equal to a threshold value, if so, the BMS turns off the main positive and negative relays of the battery system and sends "BatMaPosRlySts =0" and "batmabrgysts =0", otherwise, returning to step SX12.
The further technical scheme of the invention is as follows: the vehicle emergency power-off in the running process of the vehicle comprises the following steps:
SJ11, when the vehicle has a vehicle failure, the HCU sends "vehicle running mode = failure", the HCU sends a GCU MCU operating state request of "0x03";
SJ12, judging whether the BMS is disconnected from the high voltage and the motor rotating speed is lower than 500rpm, if so, sending an MCU and GCU motor active discharge request = 'request' by the HCU;
and SJ12 and HCU send 'vehicle running mode = dormancy' and GCU/MCU are all powered off and dormant.
The invention further adopts the technical scheme that: the step SJ12 includes the following steps:
SJ121, BMS disconnects the battery system main positive and negative relays and sends "BatMaPosRlySts =0" batmabrglysts =0".
The invention has the beneficial effects that: by adopting the double main contactors, strict logic flow control can be performed on high-voltage electric equipment during high-voltage power-on and power-off, and the main contactor fault can be effectively prevented from occurring in the high-voltage power-on and power-off current path. The hybrid electric vehicle comprises the logical control of the power-on and power-off under various high-voltage working conditions, and the reliability and the safety of the high-voltage power-on and power-off control of the hybrid electric vehicle are improved.
Drawings
Fig. 1 is a block diagram of a high-voltage power supply and discharge system according to an embodiment of the present invention.
Fig. 2 is a flowchart of controlling a power-on function of a high-voltage system according to an embodiment of the present invention.
Fig. 3 is a flowchart illustrating normal power-down function control of the high-voltage system according to an embodiment of the present invention.
Fig. 4 is a flowchart of the emergency power-off function control of the high-voltage system according to the embodiment of the invention.
Detailed Description
As shown in fig. 1, in the vehicle high-voltage power-ON and power-off system provided by the invention, a control program of the vehicle controller enables the high-voltage circuit to execute power-ON and power-off control under a normal condition and power-off control under an abnormal condition by collecting signals such as an ON-gear switching signal and a start-gear switching signal of a start key, a vehicle fault state signal, a battery feedback signal, a motor controller feedback signal, a BMS pre-charging state signal, a pre-charging contactor feedback signal and the like. The control program of the battery management system sends the data and the faults of the power battery module to the vehicle control unit, receives the 'high voltage up and down request' of the vehicle control unit to complete the control of the main positive contactor, the main negative contactor and the pre-charging contactor of the power battery, and feeds the state back to the vehicle control unit. Therefore, the high-voltage power-on and power-off control circuit of the hybrid electric vehicle adopts the double main contactors, so that strict logic flow control can be performed on high-voltage electric equipment during high-voltage power-on and power-off, and the main contactor fault in a high-voltage power-on and power-off current path can be effectively prevented.
High-voltage electrifying process: a user presses a starting key and simultaneously steps on a brake pedal, and the HCU of the whole vehicle controller is firstly electrified for self-test. And after the self-checking is passed, receiving a start gear switch signal of the PEPS of the keyless start system, and requesting the HCU to perform anti-theft verification with the PEPS. After the anti-theft verification is passed, the HCU of the vehicle control unit detects whether the vehicle has an electric fault state or not, and if the vehicle does not have the electric fault state, the HCU of the vehicle control unit requests the battery pack BMS to close the high-voltage request. The battery pack BMS receives a 'closed high-voltage request' sent by the HCU, closes the pre-charging relay firstly, closes the main negative relay again, detects that the voltage difference between the inside and the outside of the battery pack is less than 8V, sends 'the pre-charging of the battery pack is completed' to the HCU, closes the main positive relay at last, and breaks the pre-charging relay in a time-delay way, and sends 'the battery pack state is connected for the power supply' to the HCU. After the HCU of the vehicle controller receives that the battery pack state is power connection, the HCU judges that the vehicle has no high-voltage fault, if the vehicle does not have the high-voltage fault, the HCU sends a vehicle running mode of high-voltage power-on, sends an air conditioner AC working mode request of standby, sends a DCDC working mode of normal working and sends power limitation of the electric compressor. After detecting that the double motors are not in power-off failure, the HCU of the vehicle controller allows the whole vehicle to enter a drivable state, sends a vehicle running preparation state of READY to the instrument, sends a vehicle working mode of driving preparation on the network, and simultaneously sends an enabling working state request to the double motors, and high-voltage power-on is completed after the whole vehicle enters the drivable state.
High-voltage power-off process: if the key gear = IG Off/Acc or the vehicle has a high-voltage fault, if the conditions that the vehicle speed is lower than the threshold, the motor rotating speed is lower than 50rpm, the motor torque is lower than the threshold and the engine is stopped are met, the HCU sends a vehicle running mode = power-Off/fault, sends a request of operating states of the generator and the driving motor = 'prohibition' to the motor, sends a request of torque = '0' to the motor and stops the engine, and then closes all high-voltage components. The HCU sends a 'high voltage interruption request' to the BMS, and when the BMS receives the high voltage interruption request, the main positive relay and the main negative relay are disconnected after the current of the battery pack is smaller than a threshold value, so that the BMS is enabled to be in high voltage interruption. The HCU sends an active discharge request to the generator and the driving motor, and the generator and the driving motor execute active discharge. And powering off the whole vehicle key, and powering off the vehicle controller HCU, the battery pack BMS, the generator and the driving motor to realize a power-off dormancy strategy.
Emergency power-off process: if the whole vehicle has a serious fault (such as a collision), the vehicle control unit HCU sends a 'vehicle running mode = fault', sends a request for the working state of the generator and the driving motor = 'emergency stop', sends a request for torque to the motor = '0', stops the engine, and turns off all high-voltage components. The vehicle control unit HCU sends "high pressure under urgent for battery package BMS, and battery package BMS is receiving" high pressure under urgent "the time, and battery package direct disconnection owner is just, main negative relay, and then lets battery package BMS break off high pressure. The HCU sends an active discharge request to the generator and the driving motor, and the generator and the driving motor execute active discharge. And powering off the whole vehicle key, and powering off the vehicle controller HCU, the battery pack BMS, the generator and the driving motor to realize a power-off dormancy strategy.
1. The battery pre-charging system has the functions that under the condition that the battery is short-circuited or close to short-circuited as a circuit, a main positive contactor of the battery cannot be closed, an MSD switch of a protection circuit is prevented from being burnt, and the safety of the battery is protected; the whole vehicle pre-charging system provides power-on and power-off logic control for the high-voltage working condition of the electric vehicle, and the reliability and safety of the high-voltage power-on and power-off control are guaranteed; the difference with the existing whole vehicle electronic and electric architecture is not great; no independent control module is provided, so that the cost is reduced; the multiple control modules work in a matched mode, and safety is improved.
The above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the invention, but rather, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (8)
1. A vehicle high-voltage power-on and power-off control method comprises the following steps:
s1, judging which gear the PEPS key is in;
and S2, controlling the high-voltage power on and off of the vehicle according to the judgment result of the gear so that the whole vehicle is in a running state or a dormant state.
2. The vehicle high-voltage power-ON and power-Off control method according to claim 1, wherein the PEPS key in the step S1 is in two gears, namely an "ON" gear and an IG Off/Acc gear, or the whole vehicle has a high-voltage failure.
3. The vehicle high-voltage power-ON and power-off control method as claimed in claim 2, wherein when the PEPS key is switched to the ON gear, the vehicle high-voltage power-ON comprises the following steps:
SS11, judging whether the whole vehicle has no power-off fault, whether a key is used for a start gear and whether the anti-theft authentication is passed, if so, executing the next step, and if not, returning to the HCU power-on self-test of the whole vehicle controller;
SS12, judging whether the gear is in an N gear/P gear, if so, sending a battery high-voltage electrifying request as a 'closed high-voltage switch', sending a 'closed high-voltage request' to the BMS by the HCU, and if not, returning to the step SS1;
SS13, judging whether the BMS pre-charging is in a failure state; if yes, executing the next step, otherwise, returning to the step SS1;
SS14, judging whether there is no break high voltage fault, if yes, executing the next step, and if not, abandoning;
the method comprises the steps of SS15, sending a running mode of the whole vehicle to be powered on, sending an AC working mode request to be standby, sending a DCDC working mode to be S1= Buck (12V output electric energy) and sending the vehicle to be in a high-voltage connection state to an instrument;
SS16, setting 'driving preparation' in the whole vehicle working mode, sending the running preparation state of the whole vehicle to the instrument as 'READY' and entering the running state of the whole vehicle.
4. The vehicle high-voltage power-on and power-off control method according to claim 3, characterized by further comprising a self-test step in the vehicle high-voltage power-on;
SS21, initializing BMS first power-ON work in a key to ON gear system;
SS22, judging whether the BMS completes self-checking and fault detection, if so, judging that the BMS receives a high-voltage power-on request as 'closing a high-voltage switch', and if not, returning to the step SS21;
SS23, BMS close the preliminary filling relay, main negative relay, main positive relay and clear the counter sequentially separately, and count and close main negative, preliminary filling switch number of times N1;
SS24 and BMS judge whether the voltage difference between the external voltage of the battery pack and the internal voltage of the battery terminal is 8V, if so, the next step is executed, and if not, the step SS21 is returned;
SS25, judging that the voltage difference between the inside and the outside of the battery pack is less than or equal to 8V within 1500ms, if so, closing a main positive relay of the battery system by the BMS, delaying and disconnecting a pre-charging relay, and sending the high-voltage output state of the battery pack to be HV poweron.
5. The vehicle high-voltage power-on and power-Off control method as claimed in claim 4, wherein when the PEPS key is turned to IG Off/Acc or the whole vehicle has a high-voltage failure, the vehicle high-voltage power-on and power-Off comprises the following steps:
SX11, judging whether the vehicle speed is lower than a threshold value, whether the rotating speed of a motor is lower than 50rpm, whether the torque of the motor is lower than the threshold value and whether the engine is stopped, if so, sending a 'finished vehicle running mode = power-off/fault' to a motor working state request = 'forbid', a motor torque request = '0' and stopping the engine by the HCU, and if not, returning to the step SX11;
and (4) SX12, shutting down the high-voltage component and judging whether the BMS is disconnected with high voltage or not, if so, sending a motor active discharge request to the GCU/MCU by the HCU, timing 8s jewel network communication according to network management specifications, and sleeping after a low-voltage point is reached.
6. The vehicle high-voltage power-on and power-off control method according to claim 5, wherein the step SX12 further comprises the following steps:
SX121, determining whether the current of the battery pack is less than or equal to a threshold value, if so, the BMS turns off the main positive and negative relays of the battery system and sends "BatMaPosRlySts =0" and "batmabrgysts =0", otherwise, returning to step SX12.
7. The vehicle high-voltage power-on and power-off control method according to claim 6, wherein the emergency power-off of the vehicle during the running of the vehicle comprises the following steps:
SJ11, when the vehicle has a vehicle fault, the HCU sends a vehicle running mode = fault, the HCU sends a GCU MCU working state request of '0x03';
SJ12, judging whether the BMS is disconnected from the high voltage and the motor rotating speed is lower than 500rpm, if so, sending an MCU and GCU motor active discharge request = 'request' by the HCU;
and SJ12 and HCU send 'vehicle running mode = dormancy' and GCU/MCU are all powered off and dormant.
8. The vehicle high-voltage power-on and power-off control method according to claim 6, wherein the step SJ12 includes the steps of:
SJ121, BMS disconnects the battery system main positive and negative relays and sends "BatMaPosRlySts =0" batmabrglysts =0".
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| CN108382234A (en) * | 2018-02-24 | 2018-08-10 | 广汽丰田汽车有限公司 | The control method of vehicle and its preliminary filling resistance, system and storage medium |
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