CN111347891A - Electric automobile, driving device and driving system thereof, and power supply control method - Google Patents
Electric automobile, driving device and driving system thereof, and power supply control method Download PDFInfo
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- CN111347891A CN111347891A CN201811571397.4A CN201811571397A CN111347891A CN 111347891 A CN111347891 A CN 111347891A CN 201811571397 A CN201811571397 A CN 201811571397A CN 111347891 A CN111347891 A CN 111347891A
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000004891 communication Methods 0.000 claims abstract description 11
- 238000005070 sampling Methods 0.000 claims abstract description 9
- 239000013641 positive control Substances 0.000 claims description 18
- 239000013642 negative control Substances 0.000 claims description 14
- 238000001514 detection method Methods 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 8
- 230000006872 improvement Effects 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
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Classifications
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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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/10—Vehicle control parameters
- B60L2240/12—Speed
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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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
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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
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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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
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
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- Electric Propulsion And Braking For Vehicles (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to an electric automobile, a driving device, a driving system and a power supply control method thereof, wherein the driving device comprises a first control unit, a second control unit and a power supply loop; the power supply loop comprises a positive power supply line and a negative power supply line, one end of the positive power supply line is used for connecting the positive pole of the power battery, the other end of the positive power supply line is used for connecting the positive pole of the motor controller, one end of the negative power supply line is used for connecting the negative pole of the power battery, and the other end of the negative power supply line is used for connecting the negative pole of the motor controller; a power supply control switch is arranged on the positive power supply circuit and/or the negative power supply circuit in series, and the first control unit and the second control unit are both in control connection with the power supply control switch; the second control unit is connected with an emergency mode switch in a sampling mode, and the first control unit is in communication connection with the second control unit. The invention can effectively avoid the phenomenon that the power supply loop is abnormally disconnected due to the wire harness problem or the vehicle vibration, and improves the power supply reliability of the power supply loop.
Description
Technical Field
The invention relates to an electric automobile, a driving device, a driving system and a power supply control method thereof, and belongs to the technical field of electric automobile control.
Background
The energy source of the electric automobile is a power battery, and the power battery can supply power to the motor controller through a power supply loop. The power supply circuit is connected with the power supply circuit in series, and the power supply circuit is switched on and off by controlling the contactor. The existing vehicle adopts a control unit to realize the control of the contactor, and a power supply loop can be cut off emergently when a fault occurs.
However, in the operation process of the existing power supply circuit, the power supply reliability is poor due to abnormal disconnection of the power supply circuit caused by the wire harness problem or vehicle vibration. In addition, under the condition that the power battery breaks down and personal safety hidden danger possibly exists, at the moment, a decision needs to be made between protecting the battery and ensuring the personal safety, if a safe place cannot be found in a short time under a high-speed working condition for parking, and if a power supply loop is disconnected, the vehicle loses power, so that serious safety accidents are caused.
Disclosure of Invention
The invention aims to provide an electric automobile, a driving device and a driving system thereof, which are used for solving the problem of poor power supply reliability of a power supply loop of a motor controller of the conventional electric automobile.
In order to solve the problem of poor power supply reliability of a power supply loop of the conventional motor controller of the electric automobile, the invention provides a driving device of the electric automobile, which comprises a first control unit, a second control unit and a power supply loop, wherein the first control unit is used for controlling the power supply loop to be powered on; the power supply loop comprises a positive power supply line and a negative power supply line, one end of the positive power supply line is used for connecting the positive pole of the power battery, the other end of the positive power supply line is used for connecting the positive pole of the motor controller, one end of the negative power supply line is used for connecting the negative pole of the power battery, and the other end of the negative power supply line is used for connecting the negative pole of the motor controller; a power supply control switch is arranged on the positive power supply circuit and/or the negative power supply circuit in series, and the first control unit and the second control unit are both in control connection with the power supply control switch; the second control unit is connected with an emergency mode switch in a sampling mode, and the first control unit is in communication connection with the second control unit.
In order to solve the problem of poor power supply reliability of a power supply loop of the conventional motor controller of the electric automobile, the invention also provides a driving system of the electric automobile, which comprises a power battery, the motor controller and a driving device, wherein the driving device comprises a first control unit, a second control unit and the power supply loop; the power supply loop comprises a positive power supply line and a negative power supply line, one end of the positive power supply line is connected with the positive electrode of the power battery, the other end of the positive power supply line is connected with the positive electrode of the motor controller, one end of the negative power supply line is connected with the negative electrode of the power battery, and the other end of the negative power supply line is connected with the negative electrode of the motor controller; a power supply control switch is arranged on the positive power supply circuit and/or the negative power supply circuit in series, and the first control unit and the second control unit are both in control connection with the power supply control switch; the second control unit is connected with an emergency mode switch in a sampling mode, and the first control unit is in communication connection with the second control unit.
In order to solve the problem of poor power supply reliability of a power supply loop of the conventional electric vehicle motor controller, the invention also provides an electric vehicle which comprises an electric vehicle body and a driving system, wherein the driving system comprises a power battery, a motor controller and a driving device, and the driving device comprises a first control unit, a second control unit and a power supply loop; the power supply loop comprises a positive power supply line and a negative power supply line, one end of the positive power supply line is connected with the positive electrode of the power battery, the other end of the positive power supply line is connected with the positive electrode of the motor controller, one end of the negative power supply line is connected with the negative electrode of the power battery, and the other end of the negative power supply line is connected with the negative electrode of the motor controller; a power supply control switch is arranged on the positive power supply circuit and/or the negative power supply circuit in series, and the first control unit and the second control unit are both in control connection with the power supply control switch; the second control unit is connected with an emergency mode switch in a sampling mode, and the first control unit is in communication connection with the second control unit.
The invention has the beneficial effects that: in the process that the power battery supplies power to the motor controller through the power supply loop, the first control unit and the second control unit are adopted to simultaneously control the power supply control switch in the power supply loop, so that when one control unit fails to control, the other control unit can still control the power supply control switch to be closed, the phenomenon that the power supply loop is abnormally disconnected due to the wire harness problem or vehicle vibration can be effectively avoided, and the power supply reliability of the power supply loop is improved.
As further improvement of the device, the system and the automobile, in order to realize on-off control of the power supply loop, the power supply control switch comprises a total positive control switch and a total negative control switch, the total positive control switch is serially arranged on the positive power supply line, and the total negative control switch is serially arranged on the negative power supply line.
As further improvement of the device, the system and the automobile, in order to realize the pre-charging function of the power supply loop, two ends of the main positive control switch are connected with pre-charging branches in parallel, a pre-charging resistor and a pre-charging control switch are arranged in the pre-charging branches in series, and the first control unit is connected with the pre-charging control switch in a control mode.
As further improvement of the device, the system and the automobile, in order to realize vehicle speed detection and carry out corresponding judgment, the automobile speed detection device further comprises a speed detection unit, and the second control unit is connected with the speed detection unit in a sampling mode.
Based on the driving device of the electric automobile, the invention also provides a power supply control method of the electric automobile, which aims to solve the problem of safety accidents caused by the fact that the power supply loop of the motor controller of the electric automobile is disconnected to cause the power loss of the automobile when the power battery fails and the automobile cannot be parked in a short time, and comprises the following steps:
when the power battery has a non-thermal failure fault in the running process of the electric automobile, judging whether the current speed is greater than a set threshold value;
if the current vehicle speed is greater than the set threshold value, outputting a related alarm signal to the driver, simultaneously detecting whether an emergency mode switch signal is received within a first set time by the second control unit, if the emergency mode switch signal is received, controlling the power supply control switch to keep attracting by the second control unit, and simultaneously sending an instruction which does not allow the power supply control switch to be disconnected to the first control unit.
The invention has the beneficial effects that: when the power battery has a non-thermal failure fault and the current vehicle speed is large, if a driver cannot stop reliably in a short time, personal safety hazards may exist, the driver can issue an emergency mode switch signal, so that the second control unit controls the power supply control switch to keep actuation, and meanwhile, an instruction which does not allow the power supply control switch to be disconnected is sent to the first control unit, so that the power supply control switch in the power supply loop can be prevented from being disconnected, the power battery is ensured to continuously supply power to the motor controller through the power supply loop, and the problem of safety accidents caused by the fact that the power of the vehicle is lost due to the disconnection of the power supply loop is effectively avoided.
As a further improvement of the method, in order to control the disconnection of the power supply loop to prevent the expansion of the accident, if the current vehicle speed is not greater than the set threshold, the second control unit outputs a related alarm signal to the driver, and after delaying for a second set time, the second control unit controls the disconnection of the power supply control switch and sends an instruction for allowing the disconnection of the power supply control switch to the first control unit.
As a further improvement of the method, in order to control the power supply circuit to be disconnected so as to prevent the accident from expanding, when the thermal failure fault occurs to the power battery in the running process of the electric automobile, the first control unit and the second control unit both output the command of disconnecting the power supply control switch.
As a further improvement of the method, in order to reliably control the power supply circuit to be disconnected under the condition that the driver does not need to start the emergency mode, if the second control unit does not receive the emergency mode switch signal within the first set time, after delaying the second set time, the second control unit controls the power supply control switch to be disconnected, and sends an instruction which allows the power supply control switch to be disconnected to the first control unit.
Drawings
Fig. 1 is a schematic circuit diagram of a driving apparatus of an electric vehicle of the present invention;
FIG. 2 is a flow chart of a power supply control method of an electric vehicle according to the present invention;
in the drawings: 1 is a power battery, 2 is a maintenance switch, 3 is a second control unit, 4 is a total negative contactor, 5 is a first control unit, 6 is a motor controller, 7 is a fuse, 8 is a pre-charge contactor, 9 is a total positive contactor, 10 is a pre-charge resistor, and 11 is an emergency mode switch.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Drive device embodiment of electric automobile:
the embodiment provides a driving device (may be simply referred to as a driving device) of an electric automobile, which comprises a first control unit 5, a second control unit 3 and a power supply loop. Wherein, power supply circuit includes anodal power supply line and negative pole power supply line, and the one end of anodal power supply line is used for connecting the positive pole of power battery 1, and the other end is used for connecting motor controller 6's positive pole, and the one end of negative pole power supply line is used for connecting the negative pole of power battery 1, and the other end is used for connecting motor controller 6's negative pole. And power supply control switches are connected to the positive power supply circuit and the negative power supply circuit in series, and the first control unit 5 and the second control unit 3 are both in control connection with the power supply control switches. In order to receive an emergency mode switch signal sent by a driver, the second control unit 3 is further connected with an emergency mode switch 11 in a sampling mode, and the first control unit 5 is in communication connection with the second control unit 3.
In order to realize communication with the motor controller 6, the first control unit 5 and the second control unit 3 are connected with the motor controller 6 through communication lines. In order to realize on-off control of the power supply loop, the power supply control switch comprises a total positive control switch and a total negative control switch, the total positive control switch is serially arranged on the positive power supply line, and the total negative control switch is serially arranged on the negative power supply line. At the moment, the first control unit 5 is controlled and connected with the total positive control switch and the total negative control switch, and the second control unit 3 is controlled and connected with the total positive control switch and the total negative control switch. In order to prevent the supply current from being too large, and realize the pre-charging function, a pre-charging branch is connected in parallel at two ends of the main positive control switch, a pre-charging resistor 10 and a pre-charging control switch are connected in series in the pre-charging branch, and the first control unit 5 is connected with the pre-charging control switch in a control mode.
In the present embodiment, the master positive control switch is the master positive contactor 9, the master negative control switch is the master negative contactor 4, and the precharge control switch is the precharge contactor 8. At this time, the first control unit 5 is connected to the first ends of the coils of the total positive contactor 9, the total negative contactor 4, and the precharge contactor 8, and the second ends of the coils of the total positive contactor 9, the total negative contactor 4, and the precharge contactor 8 are grounded. The second control unit 3 is connected to the first ends of the coils of the main positive contactor 9 and the main negative contactor 4.
Of course, as other embodiments, the overall positive control switch, the overall negative control switch and the pre-charge control switch may be other types of controllable switches in the prior art, such as relay switches. As another embodiment, only 1 power supply control switch or 2 or more power supply control switches may be provided in series in the power supply circuit, and these power supply control switches may be provided in series in the positive power supply line and/or the negative power supply line and controlled by the first control unit 5 and the second control unit 3 to control on/off of the power supply circuit.
As shown in fig. 1, a maintenance switch 2 (including a fuse) is connected in series in the middle of the power battery 1, the positive electrode of the power battery 1 is connected with a contact of a main positive contactor 9 and a pre-charging resistor 10, the pre-charging resistor 10 is connected with one contact of a pre-charging contactor 8, the other contact of the pre-charging contactor 8 is connected with the other contact of the main positive contactor 9, and the pre-charging resistor 10, the main positive contactor 9 and the pre-charging contactor 8 form a pre-charging loop to pre-charge the motor controller 6. The positive pole of the motor controller 6 is connected with the total positive contactor 9 through the fuse 7, the negative pole of the motor controller 6 is connected with one contact of the total negative contactor 4, the negative pole of the power battery 1 is connected with the other contact of the total negative contactor 4, and a current sensor (not shown in fig. 1) is connected between the negative pole of the power battery 1 and the other contact of the total negative contactor 4 in series.
In addition, in order to realize the detection of the vehicle speed, the driving device further comprises a speed detection unit, which can be a sensor or the like that obtains the vehicle speed by measuring the rotation speed of the wheel or can directly measure the vehicle speed. The speed detection unit is in communication connection with the second control unit and is used for sending the detected vehicle speed information to the second control unit, and the second control unit judges the vehicle speed. As another embodiment, the speed detection unit may be communicatively connected to the vehicle control unit, and the vehicle control unit may determine the magnitude of the vehicle speed and send the determination result to the second control unit.
The power supply control method of the electric automobile can be described in detail in the following embodiments of the power supply control method of the electric automobile, and is not described again here.
The embodiment of the power supply control method of the electric automobile comprises the following steps:
based on the above driving apparatus of the electric vehicle, the present embodiment provides a power supply control method of the electric vehicle, and a corresponding flowchart is shown in fig. 2, and specifically includes the following steps:
(1) and if the vehicle power-on signal is received, controlling a power battery to supply power to the motor controller.
The first control unit 5 detects the state of the power battery 1, and if a vehicle power-on signal is received under the condition of no serious fault, the first control unit 5 controls the total negative contactor 4 to be attracted and controls the pre-charging contactor 8 to be attracted to pre-charge the motor controller 6. After the pre-charging is completed, the first control unit 5 controls the main positive contactor 9 to close and open the pre-charging contactor 8. And after the second control unit 3 finishes the pre-charging, the output controls the general positive contactor 9 and the general negative contactor 4 to be attracted. This ensures as a redundant control that the power supply circuit is prevented from being abnormally disconnected due to a wire harness problem or vehicle vibration.
(2) When the electric automobile runs, if the power battery has a non-thermal failure fault, judging whether the current speed is greater than a set threshold value; if the current vehicle speed is greater than the set threshold value, outputting a related alarm signal to the driver, simultaneously detecting whether an emergency mode switch signal is received within a first set time by the second control unit, if the emergency mode switch signal is received, controlling the power supply control switch to keep attracting by the second control unit, and simultaneously sending an instruction which does not allow the power supply control switch to be disconnected to the first control unit.
After the vehicle is electrified at high voltage, if the power battery 1 of the vehicle has a serious fault, whether the fault is a thermal failure fault or not is judged (the thermal failure fault is a thermal runaway fault). If the fault is a non-thermal failure fault, the first control unit 5 sends a disconnection request instruction, and the second control unit 3 judges whether power is off by the same meaning according to the vehicle working condition and the emergency mode switch signal at the moment, and the two conditions are divided at the moment:
if the current vehicle speed is greater than the set threshold value, that is, the vehicle is running at a high speed, a relevant warning signal is output to the driver, for example, the driver is informed through an instrument to cut off the power supply after a first set time, for example, the power supply is cut off after 30s, and the driver is asked to select whether to start the emergency mode. The set threshold value is used to indicate that the vehicle is running at a high speed, and may be set according to actual conditions, and in this embodiment, the set threshold value is set to 80 km/h. If the driver presses the emergency mode switch 11 within the first set time, and the second control unit 3 receives the emergency mode signal, the second control unit 3 sends a command that the power supply control switch is not allowed to be turned off to the first control unit 5, that is, the first control unit 5 is not allowed to be turned off, and meanwhile, the second control unit 3 keeps attracting the total positive contactor 9 and the total negative contactor 4 to prevent the second control unit 3 from not executing the command, and informs the driver to find a safe place to stop the vehicle as soon as possible. If the emergency mode switch signal is not received within the first set time, after delaying the second set time, for example, 30s, the second control unit 3 controls to turn off the power supply control switch, and sends an instruction allowing to turn off the power supply control switch to the first control unit 5.
If the current vehicle speed is not greater than the set threshold value, that is, the vehicle is running at a low speed, the second control unit 3 outputs a relevant warning signal to the driver, for example, the second control unit 3 reminds the driver to drive to a safe place to stop as soon as possible through a warning or speed limiting means, after delaying for a second set time, for example, after delaying for 30s, the second control unit 3 firstly controls to disconnect the main positive contactor 9 and the main negative contactor 4, the power supply circuit is disconnected, and sends a power-off permission instruction of the first control unit 5, that is, sends an instruction of permitting to disconnect the power supply control switch to the first control unit 5.
In addition, in the running process of the electric automobile, if the thermal failure fault occurs in the power battery 1 of the automobile, the thermal failure fault can cause personal safety, and the power battery 1 may be on fire, so that emergency power-off is required, the second control unit 3 sends an emergency power-off instruction, the first control unit 5 and the second control unit 3 both output an instruction of disconnecting the power supply control switch, and the first control unit 5 and the second control unit 3 control to disconnect the main positive contactor 9 and the main negative contactor 4 and inform a driver of leaving the cockpit.
It should be noted that, step (1) and step (2) in the above power supply control method for an electric vehicle are two functions that can be realized by the driving device for an electric vehicle in fig. 1, and as another embodiment, the power supply control method for an electric vehicle may not include step (1), but only include the power supply control process of step (2) during the vehicle running process.
Drive system embodiment of electric automobile:
the present embodiment provides a driving system (may be referred to as a driving system for short) for an electric vehicle, including a power battery, a motor controller and a driving device, and because the specific structure of the driving device and the connection relationship between the driving device and the power battery and the motor controller have been described in detail in the above embodiments of the driving device for an electric vehicle, they are not described again here.
The embodiment of the electric automobile:
the embodiment provides an electric vehicle, which comprises an electric vehicle body and a driving system, wherein the driving system comprises a power battery, a motor controller and a driving device, and the specific structure of the driving device and the connection relationship between the driving device and the power battery and the motor controller are described in detail in the embodiment of the driving device, and are not repeated herein.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope thereof, and although the present application is described in detail with reference to the above embodiments, those skilled in the art should understand that after reading the present application, various changes, modifications or equivalents of the embodiments of the present application can be made, and these changes, modifications or equivalents are within the protection scope of the claims of the present invention.
Claims (10)
1. The driving device of the electric automobile is characterized by comprising a first control unit, a second control unit and a power supply loop; the power supply loop comprises a positive power supply line and a negative power supply line, one end of the positive power supply line is used for connecting the positive pole of the power battery, the other end of the positive power supply line is used for connecting the positive pole of the motor controller, one end of the negative power supply line is used for connecting the negative pole of the power battery, and the other end of the negative power supply line is used for connecting the negative pole of the motor controller; a power supply control switch is arranged on the positive power supply circuit and/or the negative power supply circuit in series, and the first control unit and the second control unit are both in control connection with the power supply control switch; the second control unit is connected with an emergency mode switch in a sampling mode, and the first control unit is in communication connection with the second control unit.
2. The drive device of an electric vehicle according to claim 1, wherein the power supply control switch includes a total positive control switch and a total negative control switch, the total positive control switch being provided in series on the positive power supply line, and the total negative control switch being provided in series on the negative power supply line.
3. The driving device of the electric vehicle according to claim 2, wherein a pre-charging branch is connected in parallel to two ends of the main positive control switch, a pre-charging resistor and a pre-charging control switch are connected in series in the pre-charging branch, and the first control unit is connected to the pre-charging control switch in a control manner.
4. The driving apparatus of an electric vehicle according to claim 1, further comprising a speed detection unit, wherein the second control unit is connected to the speed detection unit.
5. The driving system of the electric automobile is characterized by comprising a power battery, a motor controller and a driving device, wherein the driving device comprises a first control unit, a second control unit and a power supply loop; the power supply loop comprises a positive power supply line and a negative power supply line, one end of the positive power supply line is connected with the positive electrode of the power battery, the other end of the positive power supply line is connected with the positive electrode of the motor controller, one end of the negative power supply line is connected with the negative electrode of the power battery, and the other end of the negative power supply line is connected with the negative electrode of the motor controller; a power supply control switch is arranged on the positive power supply circuit and/or the negative power supply circuit in series, and the first control unit and the second control unit are both in control connection with the power supply control switch; the second control unit is connected with an emergency mode switch in a sampling mode, and the first control unit is in communication connection with the second control unit.
6. The drive system of an electric vehicle according to claim 5, wherein the power supply control switch includes a total positive control switch and a total negative control switch, the total positive control switch being provided in series on the positive power supply line, and the total negative control switch being provided in series on the negative power supply line.
7. The driving system of the electric vehicle according to claim 6, wherein a pre-charging branch is connected in parallel to two ends of the main positive control switch, a pre-charging resistor and a pre-charging control switch are connected in series in the pre-charging branch, and the first control unit is in control connection with the pre-charging control switch.
8. The electric automobile is characterized by comprising an electric automobile body and a driving system, wherein the driving system comprises a power battery, a motor controller and a driving device, and the driving device comprises a first control unit, a second control unit and a power supply loop; the power supply loop comprises a positive power supply line and a negative power supply line, one end of the positive power supply line is connected with the positive electrode of the power battery, the other end of the positive power supply line is connected with the positive electrode of the motor controller, one end of the negative power supply line is connected with the negative electrode of the power battery, and the other end of the negative power supply line is connected with the negative electrode of the motor controller; a power supply control switch is arranged on the positive power supply circuit and/or the negative power supply circuit in series, and the first control unit and the second control unit are both in control connection with the power supply control switch; the second control unit is connected with an emergency mode switch in a sampling mode, and the first control unit is in communication connection with the second control unit.
9. The electric vehicle according to claim 8, wherein the power supply control switch includes a total positive control switch and a total negative control switch, the total positive control switch being provided in series on the positive power supply line, and the total negative control switch being provided in series on the negative power supply line.
10. A power supply control method of an electric vehicle to which the drive device of an electric vehicle according to claim 1 is applied, characterized by comprising the steps of:
when the power battery has a non-thermal failure fault in the running process of the electric automobile, judging whether the current speed is greater than a set threshold value;
if the current vehicle speed is greater than the set threshold value, outputting a related alarm signal to the driver, simultaneously detecting whether an emergency mode switch signal is received within a first set time by the second control unit, if the emergency mode switch signal is received, controlling the power supply control switch to keep attracting by the second control unit, and simultaneously sending an instruction which does not allow the power supply control switch to be disconnected to the first control unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811571397.4A CN111347891B (en) | 2018-12-21 | 2018-12-21 | Electric automobile, driving device, driving system and power supply control method thereof |
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| CN201811571397.4A CN111347891B (en) | 2018-12-21 | 2018-12-21 | Electric automobile, driving device, driving system and power supply control method thereof |
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| CN111347891A true CN111347891A (en) | 2020-06-30 |
| CN111347891B CN111347891B (en) | 2024-05-31 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111347891B (en) | 2024-05-31 |
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