CN110281786B - Power-on and power-off control method for electric automobile - Google Patents
Power-on and power-off control method for electric automobile Download PDFInfo
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- CN110281786B CN110281786B CN201910445296.0A CN201910445296A CN110281786B CN 110281786 B CN110281786 B CN 110281786B CN 201910445296 A CN201910445296 A CN 201910445296A CN 110281786 B CN110281786 B CN 110281786B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/14—Conductive energy transfer
- B60L53/16—Connectors, e.g. plugs or sockets, specially adapted for charging electric vehicles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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- Life Sciences & Earth Sciences (AREA)
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- Electric Propulsion And Braking For Vehicles (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a power-on and power-off control method for an electric automobile. The high-voltage power-on control method comprises the following steps: on the premise that low-voltage power-on is successful, after the VCM detects a high-voltage power-on request, a high-voltage power-on process is executed, the priority of the charged high-voltage power-on request is higher than that of a key signal, and under the condition that high-priority power-on time sequence cannot be used for high-voltage power-on due to the fact that conditions are not met, even if the low-priority power-on conditions are met, high-voltage power-on is not executed; therefore, the high-voltage power-up is divided into the driving high-voltage power-up, the slow-charge high-voltage power-up and the fast-charge high-voltage power-up. The invention can solve the problems that the failure or even the damage of the high-voltage system can be caused once the incomplete consideration or the incorrect time sequence is considered, and the personal safety of a driver can be involved in serious conditions.
Description
Technical Field
The invention relates to the technical field of electric automobile manufacturing, in particular to a power-on and power-off control method for an electric automobile.
Background
Compared with the traditional automobile, the electric automobile is provided with a set of high-voltage driving system (comprising a high-voltage power battery, an inverter, a power motor and a three-electric control system). The coordination control among the high-voltage relays of the high-voltage system and the precondition to be considered are key points for ensuring the normal operation of the electric automobile.
The power-on and power-off management of the electric automobile comprises low-voltage power-on and power-off time sequence management and high-voltage power-on and power-off time sequence management, and normal low-voltage power-on is a precondition for high-voltage power-on. Powering on the low voltage, wherein the power-on condition and priority of the low voltage need to be considered; when the high-voltage power is on, the working state, the high-voltage interlocking state, the insulating state, the gear state, the charging gun state and the priority of each controller need to be considered; when the voltage is reduced under high voltage, the vehicle speed, the battery pack temperature, the dc bus current, and the like need to be considered. However, many existing high-voltage power-on control methods do not consider how to control the high-voltage power-on under the conditions of high and low priorities, so that the control method has the defects that once incomplete consideration or incorrect timing are considered, a high-voltage system can be caused to be in fault or even damaged, and in severe cases, the personal safety of a driver can be involved.
And the vehicle controller is called VCM for short.
Disclosure of Invention
The invention aims to provide a power-on and power-off control method for an electric automobile, which can solve the problems that in the prior art, once incomplete consideration or incorrect timing is considered, a high-voltage system can be possibly broken or even damaged, and the personal safety of a driver can be possibly involved in serious conditions.
In order to solve the problems, the invention adopts the technical scheme that: the electric vehicle power-on and power-off control method is realized by adopting an electric control system, the system comprises a vehicle control unit, wherein the end 101 of the vehicle control unit is connected with one end of a key, the end 102 of the vehicle control unit is connected with the other end of the key, the third end of the key is connected with one end of a low-voltage storage battery, the end 106 of the vehicle control unit is connected with one end of a coil of a main negative relay, the other end of the coil of the main negative relay is connected with the end 109 of the vehicle control unit, the end 109 of the vehicle control unit is also connected with one end of a coil of a pre-charging relay, the other end of the coil of the pre-charging relay is connected with the end 108 of the vehicle control unit, one end of a normally open contact of the pre-charging relay is connected with one end of a high-voltage power battery pack, the other end of the normally open contact of the pre-charging relay is connected with one end of a normally open contact of a main positive relay and is connected with one end of a slow charging machine through a normally open contact of a BC relay, the other end of the normally open contact of the main positive relay is connected with the other end of the high-voltage power battery pack, the 103 end of the vehicle controller is respectively connected with one end of a low-voltage storage battery, one end of a coil of the accessory main relay and one end of a contact of the accessory main relay, the 104 end of the vehicle controller is connected with the other end of the coil of the accessory main relay, the 105 end of the vehicle controller is connected with the other end of the contact of the accessory main relay through an accessory, one end of the normally open contact of the main negative relay is connected with the other end of the high-voltage power battery pack, the other end of the normally open contact of the main negative relay is connected with the other end of the slow charging motor, the 112 end of the vehicle controller is respectively connected with one end of the coil of the BC relay, one end of the fast charging negative relay and one end of the fast charging positive relay, and the other end of the coil of the BC relay is connected with the 116 end of the vehicle controller, the other end of the fast charging negative relay coil is connected with the 111 end of the vehicle controller, one end of the fast charging positive relay coil is connected with the 110 end of the vehicle controller, the connecting line of the normally open contact of the main positive relay and the normally open contact of the BC relay is connected with one end of the fast charging interface through the normally open contact of the fast charging positive relay, the connecting line of the normally open contact of the main negative relay and the slow charging motor is connected with the other end of the fast charging interface through the normally open contact of the fast charging negative relay, one end of the motor is further connected with the connecting line of the normally open contact of the main positive relay and the normally open contact of the BC relay, the other end of the motor is further connected with the connecting line of the normally open contact of the main negative relay and the slow charging motor, the 115 end of the vehicle controller is connected with a charging cover switch signal end, and the 113 end of the vehicle controller is connected with a CC signal end of the slow charging gun, the 114 end of the vehicle control unit is connected with a CC2 signal end of a quick charging gun; the 117 end and the 118 end of the vehicle controller are connected with a CAN bus, and the vehicle controller interacts with a motor controller, a battery management system and a DCDC inverter through the CAN bus;
the power-on and power-off control method of the electric automobile comprises the following steps: the power-on and power-off control method is divided into a low-voltage power-on and power-off control method and a high-voltage power-on and power-off control method; the low-voltage power-on control method comprises the following steps: as long as the vehicle control unit detects that the key signal is valid, the CC signal of the slow charging gun is valid, the CC2 signal of the fast charging gun is valid, and the switch signal of the charging cover is valid, the vehicle control unit detects any CAN bus signal, the vehicle control unit is awakened, the vehicle control unit performs self-checking, if no fault occurs, the vehicle control unit controls the contact of the accessory main relay to be closed, low-voltage power-on is completed, and the vehicle control unit starts to send a message;
the low-voltage power-off control method comprises the following steps: the method comprises the steps that after high-voltage electricity is completed or under any condition of no high voltage electricity, low-voltage electricity processing is allowed to enter, after a whole vehicle controller is determined to be capable of entering into dormancy without a work task, a dormancy mark message is sent, as long as the whole vehicle controller detects that a key signal is invalid, a slow charging gun CC signal is invalid, a fast charging gun CC2 signal is invalid, a charging cover switch signal is invalid and the whole vehicle controller detects that no CAN signal exists on a CAN bus for 5 seconds, when the conditions are met, the whole vehicle controller disconnects a contact of an accessory main relay, and the whole vehicle controller enters into a dormancy state; the high-voltage power-off control method comprises the following steps: the method comprises the steps of under a key closing condition, under a key opening condition, under a slow charging completion condition, under a slow charging request condition during driving, under a fast charging completion condition, under a fast charging request condition during driving and under a serious fault condition.
The high-voltage power-on control method comprises the following steps: on the premise that low-voltage power-on is successful, the vehicle controller executes a high-voltage power-on process after detecting a high-voltage power-on request, the priority of the charged high-voltage power-on request is higher than that of the key signal, and under the condition that high-priority power-on time sequence cannot be powered on at high voltage due to the fact that conditions are not met, even if the low-priority power-on conditions are met, high-voltage power-on is not executed. Therefore, the high-voltage power-up is divided into the traveling high-voltage power-up, the slow-charge high-voltage power-up and the fast-charge high-voltage power-up.
In the above technical solution, a more specific solution may also be: the control method for the high-voltage electrification of the travelling crane comprises the following steps:
step S201: starting a high-voltage electrifying process of the travelling crane;
step S202: if the key signal is valid, jumping to S203, and if not, jumping back to the step S201;
step S203: the vehicle control unit performs self-checking and jumps to S204;
step S204: the vehicle controller detects the vehicle state: the pre-charging permission, the motor controller self-checking pass, the battery management system self-checking pass, the high-voltage interlocking is normal, the gear is in the P or N gear, the CC signal of the slow charging gun is invalid, and the CC2 signal of the fast charging gun is invalid, and the step is shifted to the step S206 if the signals are not in the step S205;
step S205: storing the fault;
step S206: the ignition signal of the key is valid, the brake signal is valid, the step is skipped to S207, and if not, the step is waited;
step S207: the normally open contact of the main negative relay is closed, the normally open contact of the pre-charging relay is closed, and the step S208 is skipped;
step S208: the terminal voltage of the motor rises to 90% of the voltage of the high-voltage power battery pack, the step S211 is skipped, and if the terminal voltage of the motor does not rise to 90% of the voltage of the high-voltage power battery pack, the step S210 is skipped if the pre-charging time exceeds 400 milliseconds;
step S210: skipping to step S217 if the precharge fails;
step S211: closing a normally open contact of the main positive relay, and jumping to the step S212;
step S212: within 100 milliseconds, the vehicle control unit judges whether the voltage of the high-voltage power battery pack and the voltage of the motor end are smaller than 10V, if so, the step S214 is skipped, and if not, the step S213 is skipped;
step S213: the vehicle control unit judges whether the motor has a fault, judges whether the time is more than 100 milliseconds, and jumps to the step S216 if the time is more than 100 milliseconds, or jumps to the step S212 if the time is not more than 100 milliseconds;
step S214: turning off the pre-charging relay and jumping to the step S215;
step S215: completing high-voltage electrification;
step S216: the main positive relay is in a closed fault, and the step S217 is skipped;
step S217: the main positive relay is disconnected, the main negative relay is disconnected, the pre-charging relay is disconnected, and the step S218 is skipped;
step S218: voltage is discharged, and the step S219 is skipped;
step S219: and (4) pressing under high voltage.
Further: the control method for slow charging high voltage electrifying comprises the following steps:
step S301: starting a slow charging high-voltage electrifying process;
step S302: skipping to S303 if the slow charging gun CC signal is valid and the fast charging gun CC2 signal is invalid, and if not, skipping back to S301;
step S303: the vehicle controller self-checks and jumps to S304;
step S304: the vehicle controller detects the vehicle state: the motor controller self-checking is passed, the battery management system self-checking is passed, and the high-voltage interlock is normally and simultaneously met, the pre-charging is allowed, and the step S306 is skipped, if not, the step S305 is skipped;
step S305: storing the fault;
step S306: the rotating speed of the motor is less than 10 r/min, and the motor jumps to S307 after receiving a slow charging high-voltage electrifying request signal sent by the battery management system, and waits if the rotating speed of the motor is not less than 10 r/min;
step S307: the main and negative relays are closed, the slow charging relay is closed, the pre-charging relay is closed, and the step S308 is skipped;
step S308: the voltage of the motor terminal rises to 90% of the voltage of the high-voltage power battery pack, the step S311 is skipped, and if the voltage of the motor terminal does not rise to 90% of the voltage of the high-voltage power battery pack, the step S310 is skipped if the pre-charging time exceeds 400 milliseconds;
step S310: skipping to step S317 if the precharge fails;
step S311: the main positive relay is closed, and the step S312 is skipped;
step S312: within 100 milliseconds, the motor controller judges whether the voltage of the high-voltage power battery pack and the voltage of the motor terminal are smaller than 10V, if so, the step S314 is skipped, and if not, the step S313 is skipped;
step S313: the vehicle control unit judges whether the motor has a fault, judges whether the time is more than 100 milliseconds, and jumps to the step S316 if the time is more than 100 milliseconds, or jumps to the step S312 if the time is not more than 100 milliseconds;
step S314: the pre-charging relay is disconnected, and the step S315 is skipped;
step S315: completing high-voltage electrification;
step S316: the main positive relay is in a closed fault, and the step S317 is skipped;
step S317: the main positive relay is turned off, the main negative relay is turned off, the pre-charging relay is turned off, the slow-charging relay is turned off, and the step S318 is skipped;
step S318: voltage is discharged, and the step S319 is skipped;
step S319: and (4) pressing under high voltage.
Further: the control method for the quick charging high-voltage electrification comprises the following steps:
step S401: starting a quick charging high-voltage electrifying process;
step S402: the CC2 signal of the fast charging gun is valid and the CC signal of the slow charging gun is invalid, the step is jumped to S403, if not, the step is jumped back to S401;
step S403: the vehicle control unit performs self-checking and jumps to S404;
step S404: the vehicle controller detects the vehicle state: sending a pre-charging permission instruction, passing the self-checking of the motor controller, passing the self-checking of the battery management system and normally meeting the high-voltage interlocking at the same time, and skipping to S406 if the pre-charging permission instruction, the self-checking of the battery management system and the high-voltage interlocking are not met, or skipping to the step S405;
step S405: storing the fault;
step S406: the rotating speed of the motor is less than 10 r/min, and the motor jumps to S407 after receiving a quick charge high voltage electrifying request signal sent by the battery management system, and waits if the rotating speed of the motor is not less than 10 r/min;
step S407: the main negative relay is closed, the quick charge positive relay is closed, the pre-charge relay is closed, and the step S308 is skipped;
step S408: the voltage of the motor terminal rises to 90% of the voltage of the high-voltage power battery pack, the step S311 is skipped, and if the voltage of the motor terminal does not rise to 90% of the voltage of the high-voltage power battery pack, the step S310 is skipped if the pre-charging time exceeds 400 milliseconds;
step S410: skipping to step S317 if the precharge fails;
step S411: the main positive relay is closed, and the step S312 is skipped;
step S412: within 100 milliseconds, the vehicle control unit judges whether the voltage of the high-voltage power battery pack and the voltage of the motor terminal are smaller than 10V, if so, the vehicle control unit jumps to a step S414, and if not, the vehicle control unit jumps to a step S413;
step S413: the vehicle control unit judges whether the motor has a fault, judges whether the time is more than 100 milliseconds, and jumps to the step S316 if the time is more than 100 milliseconds, or jumps to the step S412 if the time is not more than 100 milliseconds;
step S414: the pre-charging relay is disconnected, and the step S415 is skipped;
step S415: completing high-voltage electrification;
step S416: the main positive relay is in a closed fault, and the step S417 is jumped to;
step S417: the main positive relay is disconnected, the pre-charging relay is disconnected, the quick-charging positive relay is disconnected, the quick-charging negative relay is disconnected, the main negative relay is disconnected, and the step S418 is skipped;
step S418: voltage is released, and the step S419 is skipped;
step S419: and (4) pressing under high voltage.
Further: the power-off control method under the key-off condition comprises the following steps: under the driving condition, the following conditions are detected:
1) the key signal is changed from on to off;
2) the rotating speed of the motor is less than 174 rpm;
3) the highest temperature of the high-voltage power battery pack is less than 40 ℃;
4) the direct current bus current is less than 5A;
when the vehicle control unit receives the signals and meets the requirements, the following actions are sequentially executed:
(1) stopping enabling the DCDC inverter;
(2) forbidding high-voltage discharge;
(3) and the vehicle control unit controls to disconnect the main positive relay and the main negative relay.
Further: the high-pressure piezoelectric control method for the key under the open condition comprises the following steps: when the state of charge of the low-voltage storage battery is detected to be more than 95%, the following conditions are detected under the condition that the key of the current vehicle is in an open state and the DCDC inverter is used for charging the low-voltage storage battery which is lack of power and triggering high-voltage power-on:
(1) the highest temperature of the high-voltage power battery pack is less than 40 ℃;
(2) the direct current bus current is less than 5A;
after a power-off process is triggered, the vehicle control unit sequentially executes the following actions:
A. stopping enabling the DCDC inverter;
B. forbidding high-voltage discharge;
and controlling to disconnect the main positive relay and the main negative relay.
Further: the high-voltage power-off control method under the slow charging completion condition comprises the following steps: the current vehicle is in the charging state of the slow charging machine, and when the following conditions are detected at the same time, the high-voltage power-off process of the charging completion of the slow charging machine is executed:
1) detecting a low-voltage and high-voltage slow-charging request sent by the battery management system;
2) detecting that the highest temperature of the high-voltage power battery pack sent by the battery management system is less than 40 ℃;
3) and detecting that the current of the high-voltage power battery pack sent by the battery management system is less than 5A.
When the above conditions are simultaneously satisfied, the vehicle control unit executes the following actions:
A. stopping enabling the DCDC inverter;
B. forbidding high-voltage discharge;
C. controlling to disconnect the main positive relay, the main negative relay and the slow charging relay;
further: the high-voltage power-off control method under the condition of completing the quick charging comprises the following steps: when the current vehicle is in a quick charging state and any one of the following conditions is detected, a high-voltage power-off process completed by quick charging is executed:
1) detecting a voltage reduction request under a quick charge high voltage sent by the battery management system;
2) detecting that the highest temperature of the high-voltage power battery pack sent by the battery management system is less than 40 ℃;
3) detecting that the current of the high-voltage power battery pack sent by the battery management system is less than 5A;
when the above conditions are simultaneously satisfied, the vehicle control unit executes the following actions:
1) stopping enabling the DCDC inverter;
2) forbidding high-voltage discharge;
3) and controlling to disconnect the quick charge positive relay, the quick charge negative relay, the main positive relay and the main negative relay.
Further: the high voltage power down control method under the severe fault condition comprises the following steps: in the driving process, when any serious fault is detected, the following electric treatment is executed:
1) stopping enabling the DCDC inverter;
2) forbidding high-voltage discharge;
3) the motor torque command is 0;
4) when the vehicle speed is detected to be less than 9 km/h or the motor rotating speed signal is detected to be less than 174 r/min, the vehicle control unit executes the following actions:
and controlling to disconnect the main positive relay and the main negative relay.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the beneficial effects that: because the power-on requests under various conditions are subjected to priority division, and the high-priority power-on sequence is triggered under the condition that the high-priority power-on cannot be powered on at high voltage because the conditions are not met, the high-voltage power-on is not executed even if the low-priority power-on conditions are met, so that the control method cannot cause high-voltage system failure or even damage due to time sequence inconsistency, and can possibly relate to the personal safety of a driver in serious cases.
Drawings
FIG. 1 is a block schematic diagram of the control system of the present invention.
Fig. 2 is a flow chart of the high-voltage power-up of the traveling crane of the invention.
Fig. 3 is a flow chart of the slow charge high voltage power up of the present invention.
Fig. 4 is a flow chart of the fast charge high voltage power up of the present invention.
Detailed Description
The invention is described in more detail below with reference to the following figures and examples:
the power-on and power-off control method of the electric vehicle shown in fig. 1, fig. 2, fig. 3 and fig. 4 is realized by adopting an electrical control system, the system comprises a vehicle control unit 1, a 101 end of the vehicle control unit 1 is connected with one end of a key 2, a 102 end of the vehicle control unit 1 is connected with the other end of the key 2, a third end of the key 2 is connected with one end of a low-voltage storage battery 3, a 106 end of the vehicle control unit 1 is connected with one end of a coil of a main negative relay 8, the other end of the coil of the main negative relay 8 is connected with a 109 end of the vehicle control unit 1, the 109 end of the vehicle control unit 1 is also connected with one end of a coil of a pre-charging relay 6, the other end of the coil of the pre-charging relay 6 is connected with a 108 end of the vehicle control unit 1, one end of a normally-open contact of the pre-charging relay 6 is connected with one end of a high-voltage power battery pack 5, the other end of the normally-open contact of the pre-charging relay 6 is connected with one end of a normally-open contact of a main positive relay 7 and is connected with a normally-open slow-open contact of a charging relay 13 One end of a machine 14 is connected, the other end of a normally open contact of a main positive relay 7 is connected with the other end of a high-voltage power battery pack 5, the 103 end of a vehicle controller 1 is respectively connected with one end of a low-voltage storage battery 3, one end of a coil of an accessory main relay 4 and one end of a contact of the accessory main relay 4, the 104 end of the vehicle controller 1 is connected with the other end of the coil of the accessory main relay 4, the 105 end of the vehicle controller 1 is connected with the other end of the contact of the accessory main relay 4 through an accessory, one end of a normally open contact of a main negative relay 8 is connected with the other end of the high-voltage power battery pack 5, the other end of a normally open contact of a main negative relay 8 is connected with the other end of a slow charging motor 14, and the 112 end of the vehicle controller 1 is respectively connected with one end of a coil of a BC relay 13, one end of a fast charging negative relay 12 and one end of a fast charging positive relay 11, the other end of the coil of the BC relay 13 is connected with the end 116 of the vehicle controller 1, the other end of the coil of the quick-charging negative relay 12 is connected with the end 111 of the vehicle controller 1, the other end of the coil of the quick-charging positive relay 11 is connected with the end 110 of the vehicle controller 1, the line of the normally open contact of the main positive relay 7 and the normally open contact of the BC relay 13 is connected with one end of the quick-charging interface 10 through the normally open contact of the quick-charging positive relay 11, the line of the normally open contact of the main negative relay 8 and the slow-charging motor 14 is connected with the other end of the quick-charging interface 10 through the normally open contact of the quick-charging negative relay 12, the line of the normally open contact of the main positive relay 7 and the normally open contact of the BC relay 13 is connected with one end of the motor 9, the line of the normally open contact of the main negative relay 8 and the slow-charging machine 14 is connected with the other end of the motor 9, the end 115 of the vehicle controller 1 is connected with a charging cover switch signal end, a CC signal end of a slow charging gun is connected to the 113 end of the vehicle controller 1, and a CC2 signal end of a fast charging gun is connected to the 114 end of the vehicle controller 1; the 117 end and the 118 end of the vehicle control unit 1 are connected with a CAN bus, and the vehicle control unit 1 interacts with a motor controller, a battery management system and a DCDC inverter through the CAN bus;
the power-on and power-off control method of the electric automobile comprises the following steps: the power-on and power-off control method is divided into a low-voltage power-on and power-off control method and a high-voltage power-on and power-off control method; the low-voltage power-on control method comprises the following steps: as long as the vehicle control unit 1 detects that a key 2 signal is valid, a slow charging gun CC signal is valid, a fast charging gun CC2 signal is valid, and a charging cover switch signal is valid, the vehicle control unit 1 detects any CAN bus signal, the vehicle control unit 1 is awakened, the vehicle control unit 1 performs self-checking, if no fault occurs, the vehicle control unit 1 controls a contact of an accessory main relay 4 to be closed, low-voltage power-on is completed, and the vehicle control unit 1 starts to send a message;
the low-voltage power-off control method comprises the following steps: the method comprises the steps that after high-voltage electricity is completed or under any condition of no high voltage electricity, electricity processing under low voltage is allowed to enter, after the whole vehicle controller 1 has no work task and determines that the whole vehicle controller CAN enter into dormancy, a dormancy mark message is sent, as long as the whole vehicle controller 1 detects that a key 2 signal is invalid, a slow charging gun CC signal is invalid, a fast charging gun CC2 signal is invalid, a charging cover switch signal is invalid and the whole vehicle controller 1 detects that no CAN signal exists on a CAN bus for 5 seconds, when the conditions are met, the whole vehicle controller 1 disconnects a contact of an accessory main relay 4, and the whole vehicle controller 1 enters into a dormancy state; the high-voltage power-off control method comprises the following steps: the method comprises the steps of under a key closing condition, under a key opening condition, under a slow charging completion condition, under a slow charging request condition during driving, under a fast charging completion condition, under a fast charging request condition during driving and under a serious fault condition.
The high-voltage power-on control method comprises the following steps: on the premise that low-voltage power-on is successful, the vehicle control unit 1 executes a high-voltage power-on process after detecting a high-voltage power-on request, the priority of the charged high-voltage power-on request is higher than that of the key 2 signal, and under the condition that high-priority power-on time sequence cannot be powered on at high voltage due to the fact that conditions are not met, even if the low-priority power-on conditions are met, high-voltage power-on is not executed. Therefore, the high-voltage power-up is divided into the traveling high-voltage power-up, the slow-charge high-voltage power-up and the fast-charge high-voltage power-up.
The control method for the high-voltage electrification of the travelling crane comprises the following steps:
step S201: starting a high-voltage electrifying process of the travelling crane;
step S202: the key 2 signal is valid, jumping to S203, if not, jumping back to step S201;
step S203: self-checking the vehicle controller 1, and jumping to S204;
step S204: vehicle control unit 1 detects whole car state: the pre-charging permission, the motor controller self-checking pass, the battery management system self-checking pass, the high-voltage interlocking is normal, the gear is in P or N gear, the CC signal of the slow charging gun is invalid, the CC2 signal of the fast charging gun is invalid, and the step S206 is skipped if the signals are not satisfied;
step S205: storing the fault;
step S206: the ignition signal of the key 2 is valid, the brake signal is valid, the process skips to S207, and if not, the process waits;
step S207: the normally open contact of the main negative relay 8 is closed, the normally open contact of the pre-charging relay 6 is closed, and the step S208 is skipped;
step S208: the terminal voltage of the motor 9 rises to 90% of the voltage of the high-voltage power battery pack 5, the step S211 is skipped, and if the terminal voltage does not rise to 90% of the voltage of the high-voltage power battery pack, the step S210 is skipped if the precharging time exceeds 400 milliseconds;
step S210: skipping to step S217 if the precharge fails;
step S211: closing the normally open contact of the main positive relay 7, and jumping to the step S212;
step S212: within 100 milliseconds, the vehicle control unit 1 judges whether the voltage of the high-voltage power battery pack 5 and the voltage of the motor end are less than 10 volts, if so, the step S214 is skipped, and if not, the step S213 is skipped;
step S213: the vehicle control unit 1 judges whether the motor 9 has a fault, judges whether the time is more than 100 milliseconds, and if so, jumps to a step S216, otherwise jumps to a step S212;
step S214: turning off the pre-charging relay 6, and jumping to the step S215;
step S215: completing high-voltage electrification;
step S216: the main positive relay 7 is in a closed fault, and the step S217 is skipped;
step S217: the main positive relay 7 is turned off, the main negative relay 8 is turned off, the pre-charging relay 6 is turned off, and the step S218 is skipped;
step S218: voltage is discharged, and the step S219 is skipped;
step S219: and (4) pressing under high voltage.
The control method for slow charging high-voltage electrification comprises the following steps:
step S301: starting a slow charging high-voltage electrifying process;
step S302: skipping to S303 if the CC signal of the slow charging gun is valid and the CC2 signal of the fast charging gun is invalid, and if not, skipping back to S301;
step S303: self-checking the vehicle controller 1, and jumping to S304;
step S304: the vehicle control unit 1 detects the vehicle state: the motor controller self-checking is passed, the battery management system self-checking is passed, the high-voltage interlocking is normally met at the same time, the pre-charging is allowed, and the step S306 is skipped to, if the pre-charging is not allowed, the step S305 is skipped to;
step S305: storing the fault;
step S306: the rotating speed of the motor 9 is less than 10 r/min, and the motor jumps to S307 after receiving a slow charging high voltage electrifying request signal sent by the battery management system, and waits if the slow charging high voltage electrifying request signal is not sent by the battery management system;
step S307: the main negative relay 8 is closed, the slow charging relay 13 is closed, the pre-charging relay 6 is closed, and the step S308 is skipped;
step S308: the voltage of the motor 9 terminal rises to 90% of the voltage of the high-voltage power battery pack 5, the step S311 is skipped, and if the voltage of the motor 9 terminal does not rise to 90% of the voltage of the high-voltage power battery pack, the precharging time exceeds 400 milliseconds, the step S310 is skipped;
step S310: skipping to step S317 if the precharge fails;
step S311: closing the main positive relay 7, and jumping to the step S312;
step S312: within 100 milliseconds, the motor controller judges whether the voltage of the high-voltage power battery pack 5 and the voltage of the motor 9 are smaller than 10V, if so, the step S314 is skipped, and if not, the step S313 is skipped;
step S313: the vehicle control unit 1 judges whether the motor 9 has a fault, judges whether the time is more than 100 milliseconds, and jumps to the step S316 if the time is greater than 100 milliseconds, or jumps to the step S312 if the time is not greater than 100 milliseconds;
step S314: switching off the pre-charging relay 6 and jumping to the step S315;
step S315: completing high-voltage electrification;
step S316: the main positive relay 7 is in a closed fault, and the step S317 is skipped;
step S317: the main positive relay 7 is turned off, the main negative relay 8 is turned off, the pre-charging relay 6 is turned off, the slow-charging relay 13 is turned off, and the process goes to step S318;
step S318: voltage is discharged, and the step S319 is skipped;
step S319: and (4) pressing under high voltage.
The control method for the quick charging high-voltage electrification comprises the following steps:
step S401: starting a quick charging high-voltage electrifying process;
step S402: skipping to S403 if the signal of the fast charging gun CC2 is valid and the signal of the slow charging gun CC is invalid, and if not, skipping back to the step S401;
step S403: self-checking the vehicle controller 1, and jumping to S404;
step S404: the vehicle control unit 1 detects the vehicle state: sending a pre-charging permission instruction, passing the self-checking of the motor controller, passing the self-checking of the battery management system and normally and simultaneously meeting the high-voltage interlocking, and skipping to S406 if the pre-charging permission instruction, the self-checking of the battery management system and the high-voltage interlocking are not met, or skipping to the step S405;
step S405: storing the fault;
step S406: the rotating speed of the motor 9 is less than 10 r/min, and the motor jumps to S407 after receiving a quick-charging high-voltage electrifying request signal sent by the battery management system, and waits if the rotating speed is not less than 10 r/min;
step S407: the main negative relay 8 is closed, the quick charging negative relay 12 is closed, the quick charging positive relay 11 is closed, the pre-charging relay 6 is closed, and the step S308 is skipped;
step S408: the voltage of the motor 9 terminal rises to 90% of the voltage of the high-voltage power battery pack 5, the step S311 is skipped, and if the voltage of the motor 9 terminal does not rise to 90% of the voltage of the high-voltage power battery pack, the precharging time exceeds 400 milliseconds, the step S310 is skipped;
step S410: skipping to step S317 if the precharge fails;
step S411: closing the main positive relay 7 and jumping to the step S312;
step S412: within 100 milliseconds, the vehicle control unit 1 judges whether the voltage of the high-voltage power battery pack 5 and the voltage of the motor 9 are smaller than 10V, if so, the step S414 is skipped, and if not, the step S413 is skipped;
step S413: the vehicle control unit 1 judges whether the motor 9 has a fault, judges whether the time is more than 100 milliseconds, and jumps to the step S316 if the time is greater than 100 milliseconds, or jumps to the step S412 if the time is not greater than 100 milliseconds;
step S414: pre-charging relay 6 is turned off, and the process jumps to step S415;
step S415: completing high-voltage electrification;
step S416: the main positive relay 7 is in a closed fault, and the step S417 is jumped to;
step S417: the main positive relay 7 is disconnected, the pre-charging relay 6 is disconnected, the quick charging positive relay 11 is disconnected, the quick charging negative relay 12 is disconnected, the main negative relay 8 is disconnected, and the step S418 is skipped;
step S418: voltage is discharged, and the step S419 is jumped to;
step S419: and (4) pressing under high voltage.
The power-off control method under the key-off condition comprises the following steps: under the driving condition, the following conditions are detected:
1) the key 2 signal goes from on to off;
2) the rotating speed of the motor 9 is less than 174 r/min;
3) the highest temperature of the high-voltage power battery pack 5 is less than 40 ℃;
4) the direct current bus current is less than 5A;
when the vehicle control unit 1 receives the signals and meets the requirements, the following actions are sequentially executed:
(1) stopping enabling the DCDC inverter;
(2) forbidding high-voltage discharge;
(3) the control opens the main positive relay 7 and the main negative relay 8.
The high-pressure piezoelectric control method for the key under the condition of opening is as follows: when the state of charge of the low-voltage battery 3 is detected to be greater than 95%, the following conditions are detected, in the case where the key 2 of the present vehicle is in the on state, and the DCDC inverter is used to charge the low-voltage battery 3 with insufficient power to trigger high-voltage power-on:
(1) the highest temperature of the high-voltage power battery pack 5 is less than 40 ℃;
(2) the direct current bus current is less than 5A;
after the power-off process is triggered, the vehicle control unit 1 sequentially executes the following actions:
A. stopping enabling the DCDC inverter;
B. forbidding high-voltage discharge;
the control opens the main positive relay 7 and the main negative relay 8.
The high-voltage power-off control method under the condition of slow charging completion comprises the following steps: when the current vehicle is in the charging state of the slow charging machine 14, and the following conditions are detected at the same time, the high-voltage power-off process of the charging completion of the slow charging machine 14 is executed:
1) detecting a low-voltage and high-voltage slow-charging request sent by a battery management system;
2) detecting that the highest temperature of a high-voltage power battery pack 5 sent by a battery management system is less than 40 ℃;
3) and detecting that the current of the high-voltage battery pack 5 sent by the battery management system is less than 5A.
When the above conditions are satisfied simultaneously, the vehicle control unit 1 executes the following actions:
A. stopping enabling the DCDC inverter;
B. forbidding high-voltage discharge;
C. the main positive relay 7, the main negative relay 8 and the slow charging relay 13 are controlled to be disconnected;
the high-voltage power-off control method under the condition of quick charge completion comprises the following steps: when the current vehicle is in a quick charging state and any one of the following conditions is detected, a high-voltage power-off process finished by quick charging is executed:
1) detecting a voltage reduction request under a fast charge high voltage sent by a battery management system;
2) detecting that the highest temperature of a high-voltage power battery pack 5 sent by a battery management system is less than 40 ℃;
3) detecting that the current of a high-voltage power battery pack 5 sent by a battery management system is less than 5A;
when the above conditions are simultaneously satisfied, the vehicle control unit 1 executes the following actions:
1) stopping enabling the DCDC inverter;
2) forbidding high-voltage discharge;
3) and the quick charging positive relay 11, the quick charging negative relay 12, the main positive relay 7 and the main negative relay 8 are controlled to be disconnected.
The high-voltage power-down control method under the condition of the quick charging request during driving comprises the following steps: when the current vehicle is in quick charge and charge, when any one of the following conditions is detected, a high-voltage power-off process under the condition of a quick charge request during driving is executed:
1) the battery management system sends a charging stop message;
2) the vehicle speed is more than 3 km/h;
when the low-voltage storage battery 3 is currently in a driving state or is charged by a DCDC inverter, high-voltage power-off is executed when the following conditions are detected;
1) detecting that the rotating speed signal of the motor 9 is less than 174 rpm;
2) detecting that the CC signal of the slow charging gun is invalid and the CC2 signal of the fast charging gun is valid;
3) detecting that the bus current is less than 5A;
when the above conditions are simultaneously satisfied, the vehicle control unit 1 executes the following actions:
1) stopping enabling the DCDC inverter;
2) forbidding high-voltage discharge;
3) the control opens the main positive relay 7 and the main negative relay 8.
A high-voltage power-down control method under a severe fault condition comprises the following steps: in the driving process, when any serious fault is detected, the following electric treatment is executed:
1) stopping enabling the DCDC inverter;
2) forbidding high-voltage discharge;
3) the motor 9 torque command is 0;
4) when the vehicle speed is detected to be less than 9 km/h or the rotating speed signal of the motor 9 is detected to be less than 174 rpm, the vehicle control unit 1 executes the following actions:
the control opens the main positive relay 7 and the main negative relay 8.
Claims (9)
1. A power-on and power-off control method for an electric automobile is characterized by comprising the following steps: the system is realized by adopting an electrical control system, the system comprises a vehicle control unit, wherein the 101 end of the vehicle control unit is connected with one end of a key, the 102 end of the vehicle control unit is connected with the other end of the key, the third end of the key is connected with one end of a low-voltage storage battery, the 106 end of the vehicle control unit is connected with one end of a coil of a main negative relay, the other end of the coil of the main negative relay is connected with the 109 end of the vehicle control unit, the 109 end of the vehicle control unit is also connected with one end of a coil of a pre-charging relay, the other end of the coil of the pre-charging relay is connected with the 108 end of the vehicle control unit, one end of a normally open contact of the pre-charging relay is connected with one end of a high-voltage power battery pack, the other end of the normally open contact of the pre-charging relay is connected with one end of the normally open contact of the main positive relay and is connected with one end of a slow charging machine through the normally open contact of a BC relay, the other end of the normally open contact of the main positive relay is connected with the other end of the high-voltage power battery pack, the 103 end of the vehicle controller is respectively connected with one end of a low-voltage storage battery, one end of a coil of the accessory main relay and one end of a contact of the accessory main relay, the 104 end of the vehicle controller is connected with the other end of the coil of the accessory main relay, the 105 end of the vehicle controller is connected with the other end of the contact of the accessory main relay through an accessory, one end of the normally open contact of the main negative relay is connected with the other end of the high-voltage power battery pack, the other end of the normally open contact of the main negative relay is connected with the other end of the slow charging motor, the 112 end of the vehicle controller is respectively connected with one end of the coil of the BC relay, one end of the fast charging negative relay and one end of the fast charging positive relay, and the other end of the coil of the BC relay is connected with the 116 end of the vehicle controller, the other end of the fast charging negative relay coil is connected with the 111 end of the vehicle controller, one end of the fast charging positive relay coil is connected with the 110 end of the vehicle controller, the connecting line of the normally open contact of the main positive relay and the normally open contact of the BC relay is connected with one end of the fast charging interface through the normally open contact of the fast charging positive relay, the connecting line of the normally open contact of the main negative relay and the slow charging motor is connected with the other end of the fast charging interface through the normally open contact of the fast charging negative relay, one end of the motor is further connected with the connecting line of the normally open contact of the main positive relay and the normally open contact of the BC relay, the other end of the motor is further connected with the connecting line of the normally open contact of the main negative relay and the slow charging motor, the 115 end of the vehicle controller is connected with a charging cover switch signal end, and the 113 end of the vehicle controller is connected with a CC signal end of the slow charging gun, the 114 end of the vehicle control unit is connected with a CC2 signal end of a quick charging gun; the 117 end and the 118 end of the vehicle controller are connected with a CAN bus, and the vehicle controller interacts with a motor controller, a battery management system and a DCDC inverter through the CAN bus;
the power-on and power-off control method of the electric automobile comprises the following steps: the power-on and power-off control method is divided into a low-voltage power-on and power-off control method and a high-voltage power-on and power-off control method; the low-voltage power-on control method comprises the following steps: as long as the vehicle control unit detects that the key signal is valid, the CC signal of the slow charging gun is valid, the CC2 signal of the fast charging gun is valid, and the switch signal of the charging cover is valid, and the vehicle control unit detects any CAN bus signal, the vehicle control unit is awakened, the vehicle control unit performs self-checking, if no fault occurs, the vehicle control unit controls the contact of the accessory main relay to be closed, low-voltage power-on is completed, and the vehicle control unit starts to send a message;
the low-voltage power-off control method comprises the following steps: the method comprises the steps that after high-voltage electricity is completed or under any condition of no high voltage electricity, low-voltage electricity processing is allowed to enter, after a whole vehicle controller is determined to be capable of entering into dormancy without a work task, a dormancy mark message is sent, as long as the whole vehicle controller detects that a key signal is invalid, a slow charging gun CC signal is invalid, a fast charging gun CC2 signal is invalid, a charging cover switch signal is invalid and the whole vehicle controller detects that no CAN signal exists on a CAN bus for 5 seconds, when the conditions are met, the whole vehicle controller disconnects a contact of an accessory main relay, and the whole vehicle controller enters into a dormancy state; the high-voltage power-off control method comprises the following steps: a high-voltage low-voltage method under the key-off condition, the key is under the key-on condition, the slow charging completion condition, the slow charging request condition during driving, the fast charging completion condition, the fast charging request condition during driving and the serious fault condition;
the high-voltage power-on control method comprises the following steps: on the premise that low-voltage power-on is successful, the vehicle controller executes a high-voltage power-on process after detecting a high-voltage power-on request, the priority of the charged high-voltage power-on request is higher than that of the key signal, and under the condition that high-priority power-on time sequence cannot be powered on at high voltage due to the fact that conditions are not met, even if the low-priority power-on conditions are met, high-voltage power-on is not executed; therefore, the high-voltage power-on is divided into the high-voltage power-on of the travelling crane, the slow charging high-voltage power-on and the fast charging high-voltage power-on;
the control method for the high-voltage electrification of the travelling crane comprises the following steps:
step S201: starting a high-voltage electrifying process of the travelling crane;
step S202: if the key signal is valid, jumping to S203, and if not, jumping back to the step S201;
step S203: the vehicle control unit performs self-checking and jumps to S204;
step S204: the vehicle controller detects the vehicle state: the pre-charging permission, the motor controller self-checking pass, the battery management system self-checking pass, the high-voltage interlocking is normal, the gear is in the P or N gear, the CC signal of the slow charging gun is invalid, and the CC2 signal of the fast charging gun is invalid, and the step is shifted to the step S206 if the signals are not in the step S205;
step S205: storing the fault;
step S206: the ignition signal of the key is valid, the brake signal is valid, the step is skipped to S207, and if not, the step is waited;
step S207: the normally open contact of the main negative relay is closed, the normally open contact of the pre-charging relay is closed, and the step S208 is skipped;
step S208: the terminal voltage of the motor rises to 90% of the voltage of the high-voltage battery pack, the step S211 is skipped, and if the terminal voltage of the motor does not rise to 90% of the voltage of the high-voltage battery pack, the step S210 is skipped if the pre-charging time exceeds 400 milliseconds;
step S210: skipping to step S217 when the pre-charging fails;
step S211: closing a normally open contact of the main positive relay, and jumping to the step S212;
step S212: within 100 milliseconds, the vehicle control unit judges whether the voltage of the high-voltage power battery pack and the voltage of the motor end are smaller than 10V, if so, the step S214 is skipped, and if not, the step S213 is skipped;
step S213: the vehicle control unit judges whether the motor has a fault, judges whether the time is more than 100 milliseconds, and jumps to the step S216 if the time is more than 100 milliseconds, or jumps to the step S212 if the time is not more than 100 milliseconds;
step S214: turning off the pre-charging relay and jumping to the step S215;
step S215: completing high-voltage electrification;
step S216: the main positive relay is in a closed fault, and the step S217 is skipped;
step S217: the main positive relay is disconnected, the main negative relay is disconnected, the pre-charging relay is disconnected, and the step S218 is skipped;
step S218: voltage is discharged, and the step S219 is skipped;
step S219: and the high voltage is reduced.
2. The electric vehicle power-on and power-off control method according to claim 1, characterized in that: the control method for slow charging high voltage electrifying comprises the following steps:
step S301: starting a slow charging high-voltage electrifying process;
step S302: skipping to S303 if the slow charging gun CC signal is valid and the fast charging gun CC2 signal is invalid, and if not, skipping back to S301;
step S303: the vehicle controller self-checks and jumps to S304;
step S304: the vehicle controller detects the vehicle state: the motor controller self-checking is passed, the battery management system self-checking is passed, and the high-voltage interlock is normally and simultaneously met, the pre-charging is allowed, and the step S306 is skipped, if not, the step S305 is skipped;
step S305: storing the fault;
step S306: the rotating speed of the motor is less than 10 r/min, and the motor jumps to S307 after receiving a slow charging high-voltage electrifying request signal sent by the battery management system, and waits if the rotating speed of the motor is not less than 10 r/min;
step S307: the main and negative relays are closed, the slow charging relay is closed, the pre-charging relay is closed, and the step S308 is skipped;
step S308: the voltage of the motor terminal rises to 90% of the voltage of the high-voltage power battery pack, the step S311 is skipped, and if the pre-charging time is not more than 400 milliseconds, the step S310 is skipped;
step S310: skipping to step S317 when the pre-charging fails;
step S311: the main positive relay is closed, and the step S312 is skipped;
step S312: within 100 milliseconds, the motor controller judges whether the voltage of the high-voltage power battery pack and the voltage of the motor terminal are smaller than 10V, if so, the step S314 is skipped, and if not, the step S313 is skipped;
step S313: the vehicle control unit judges whether the motor has a fault, judges whether the time is more than 100 milliseconds, and jumps to the step S316 if the time is more than 100 milliseconds, or jumps to the step S312 if the time is not more than 100 milliseconds;
step S314: the pre-charging relay is disconnected, and the step S315 is skipped;
step S315: completing high-voltage electrification;
step S316: the main positive relay is in a closed fault, and the step S317 is skipped;
step S317: the main positive relay is switched off, the main negative relay is switched off, the pre-charging relay is switched off, the slow-charging relay is switched off, and the step S318 is skipped;
step S318: voltage is discharged, and the step S319 is skipped;
step S319: and (4) pressing under high voltage.
3. The electric vehicle power-on and power-off control method according to claim 1, characterized in that: the control method for the quick charging high-voltage electrification comprises the following steps:
step S401: starting a quick charging high-voltage electrifying process;
step S402: the CC2 signal of the fast charging gun is valid and the CC signal of the slow charging gun is invalid, the step is jumped to S403, if not, the step is jumped back to S401;
step S403: the vehicle control unit performs self-checking and jumps to S404;
step S404: the vehicle controller detects the vehicle state: sending a pre-charging permission instruction, passing the self-checking of the motor controller, passing the self-checking of the battery management system and normally meeting the high-voltage interlocking at the same time, and skipping to S406 if the pre-charging permission instruction, the self-checking of the battery management system and the high-voltage interlocking are not met, or skipping to the step S405;
step S405: storing the fault;
step S406: the rotating speed of the motor is less than 10 r/min, and the motor jumps to S407 after receiving a quick charge high voltage electrifying request signal sent by the battery management system, and waits if the rotating speed of the motor is not less than 10 r/min;
step S407: the main negative relay is closed, the quick charge positive relay is closed, the pre-charge relay is closed, and the step S308 is skipped;
step S408: the voltage of the motor terminal rises to 90% of the voltage of the high-voltage power battery pack, the step S311 is skipped, and if the voltage of the motor terminal does not rise to 90% of the voltage of the high-voltage power battery pack, the step S310 is skipped if the pre-charging time exceeds 400 milliseconds;
step S410: skipping to step S317 if the precharge fails;
step S411: the main positive relay is closed, and the step S312 is skipped;
step S412: within 100 milliseconds, the vehicle control unit judges whether the voltage of the high-voltage power battery pack and the voltage of the motor terminal are smaller than 10V, if so, the step S414 is skipped, and if not, the step S413 is skipped;
step S413: the vehicle control unit judges whether the motor has a fault, judges whether the time is more than 100 milliseconds, and jumps to the step S316 if the time is more than 100 milliseconds, or jumps to the step S412 if the time is not more than 100 milliseconds;
step S414: the pre-charging relay is disconnected, and the step S415 is skipped;
step S415: completing high-voltage electrification;
step S416: the main positive relay is in a closed fault, and the step S417 is jumped to;
step S417: the main positive relay is disconnected, the pre-charging relay is disconnected, the quick-charging positive relay is disconnected, the quick-charging negative relay is disconnected, the main negative relay is disconnected, and the step S418 is skipped;
step S418: voltage is discharged, and the step S419 is jumped to;
step S419: and (4) pressing under high voltage.
4. The electric vehicle power-on and power-off control method according to claim 1, characterized in that: the power-off control method under the key-off condition comprises the following steps: under the driving condition, the following conditions are detected:
1) the key signal is changed from on to off;
2) the rotating speed of the motor is less than 174 rpm;
3) the highest temperature of the high-voltage power battery pack is less than 40 ℃;
4) the direct current bus current is less than 5A;
when the vehicle control unit receives the signals and meets the requirements, the following actions are sequentially executed:
(1) stopping enabling the DCDC inverter;
(2) forbidding high-voltage discharge;
(3) and the vehicle control unit controls to disconnect the main positive relay and the main negative relay.
5. The electric vehicle power-on and power-off control method according to claim 1, characterized in that: the high-pressure piezoelectric control method for the key under the open condition comprises the following steps: when the state of charge of the low-voltage battery is detected to be more than 95% under the condition that the key of the current vehicle is in an open state and the DCDC inverter is used for charging the low-voltage battery which is lack of power and triggering high-voltage power-on, the following conditions are detected:
(1) the highest temperature of the high-voltage power battery pack is less than 40 ℃;
(2) the direct current bus current is less than 5A;
after a power-off process is triggered, the vehicle control unit sequentially executes the following actions:
A. stopping enabling the DCDC inverter;
B. forbidding high-voltage discharge;
and controlling to disconnect the main positive relay and the main negative relay.
6. The electric vehicle power-on and power-off control method according to claim 1, characterized in that: the high-voltage power-off control method under the slow charging completion condition comprises the following steps: when the current vehicle is in a charging state of a slow charging machine and the following conditions are detected at the same time, executing a high-voltage power-off process of completing charging by the slow charging machine:
1) detecting a low-voltage and high-voltage slow-charging request sent by the battery management system;
2) detecting that the highest temperature of the high-voltage power battery pack sent by the battery management system is less than 40 ℃;
3) detecting that the current of the high-voltage power battery pack sent by the battery management system is less than 5A;
when the above conditions are simultaneously satisfied, the vehicle control unit executes the following actions:
A. stopping enabling the DCDC inverter;
B. forbidding high-voltage discharge;
C. and controlling to disconnect the main positive relay, the main negative relay and the slow charging relay.
7. The electric vehicle power-on and power-off control method according to claim 1, characterized in that: the high-voltage power-off control method of the quick charging completion condition comprises the following steps: when the current vehicle is in a quick charging state and any one of the following conditions is detected, a high-voltage power-off process finished by quick charging is executed:
1) detecting a voltage reduction request under a fast charge high voltage sent by the battery management system;
2) detecting that the highest temperature of the high-voltage power battery pack sent by the battery management system is less than 40 ℃;
3) detecting that the current of the high-voltage power battery pack sent by the battery management system is less than 5A;
when the above conditions are simultaneously satisfied, the vehicle control unit executes the following actions:
1) stopping enabling the DCDC inverter;
2) forbidding high-voltage discharge;
3) and controlling to disconnect the quick charge positive relay, the quick charge negative relay, the main positive relay and the main negative relay.
8. The electric vehicle power-on and power-off control method according to claim 1, characterized in that: the high-voltage power-down control method under the condition of the quick charging request during driving comprises the following steps: when the current vehicle is in quick charge and charge, when any one of the following conditions is detected, a high-voltage power-off process under the condition of a quick charge request during driving is executed:
1) the battery management system sends a charging stop message;
2) the vehicle speed is more than 3 km/h;
when the low-voltage storage battery is currently in a driving state or a charging state of the low-voltage storage battery by the DCDC inverter and the following conditions are detected, high-voltage power down is executed;
1) detecting that the motor speed signal is less than 174 rpm;
2) detecting that the CC signal of the slow charging gun is invalid and the CC2 signal of the fast charging gun is valid;
3) detecting that the bus current is less than 5A;
when the above conditions are simultaneously satisfied, the vehicle control unit executes the following actions:
1) stopping enabling the DCDC inverter;
2) forbidding high-voltage discharge;
3) and controlling to disconnect the main positive relay and the main negative relay.
9. The electric vehicle power-on and power-off control method according to claim 1, characterized in that: the high voltage power down control method under the severe fault condition comprises the following steps: in the driving process, when any serious fault is detected, the following electric treatment is executed:
1) stopping enabling the DCDC inverter;
2) forbidding high-voltage discharge;
3) the motor torque command is 0;
4) when the vehicle speed is detected to be less than 9 km/h or the motor rotating speed signal is detected to be less than 174 r/min, the vehicle control unit executes the following actions: and controlling to disconnect the main positive relay and the main negative relay.
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| CN111216556A (en) * | 2020-02-20 | 2020-06-02 | 新石器慧通（北京）科技有限公司 | Low-voltage power storage unit charging control method and system and unmanned vehicle |
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