CN111619350A - Vehicle control method, vehicle control system and vehicle - Google Patents
Vehicle control method, vehicle control system and vehicle Download PDFInfo
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- CN111619350A CN111619350A CN201910147532.0A CN201910147532A CN111619350A CN 111619350 A CN111619350 A CN 111619350A CN 201910147532 A CN201910147532 A CN 201910147532A CN 111619350 A CN111619350 A CN 111619350A
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- voltage
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- drive motor
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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
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or 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
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Hybrid Electric Vehicles (AREA)
Abstract
The disclosure relates to a vehicle control method, a vehicle control system and a vehicle, which can improve vehicle robustness and reduce safety risks caused by power interruption especially in high-speed working conditions. The method comprises the following steps: the battery management system detects the state of the high-voltage battery system; when the state indicates that the high-voltage battery system has a fault level requiring disconnection of a high-voltage relay, the battery management system reports the fault level to the vehicle control unit; and after the front drive motor system stabilizes the high voltage to meet the voltage required by the work of the DC/DC converter, the whole vehicle controller also enables the DC/DC converter and controls the rear drive motor system to perform zero torque control.
Description
Technical Field
The disclosure relates to the field of vehicles, in particular to a vehicle control method, a vehicle control system and a vehicle.
Background
In the prior art, when a high-voltage battery system of a hybrid vehicle has a fault that cannot provide electric energy, the following control schemes are generally available.
The first approach is to directly prohibit the vehicle from traveling. However, this solution reduces the overall vehicle robustness in case the engine can still drive the vehicle after the high voltage battery system fails.
The second scheme is that the power output of the vehicle is interrupted firstly, the driver is prompted to stop the vehicle at the side, the driver can restart the vehicle after the vehicle stops, at the moment, the vehicle defaults to forbid a high-pressure air conditioner, high-pressure warm air and a non-enabled DC/DC converter, the front-drive motor system is controlled to be in a bus voltage mode, the DC/DC converter is enabled after the direct-current high voltage is stabilized, and if the rear-drive system is a motor and the motor cannot be mechanically disconnected with the speed reducer, the zero torque of the rear-drive system is controlled (if the rear-drive system of the vehicle is a motor and the accelerator can be mechanically disconnected. And after the DC/DC converter works normally, the finished vehicle system is prompted to be ready for running. The scheme is that the drivability can be restored only by stopping the vehicle and then powering up the vehicle after power interruption, so that the use by consumers is inconvenient, and dangerous conditions are easy to occur in high-speed working conditions.
Disclosure of Invention
The invention aims to provide a vehicle control method, a vehicle control system and a vehicle, which can improve the robustness of the vehicle and reduce the safety risk caused by power interruption especially in a high-speed working condition.
According to a first embodiment of the present disclosure, a method for controlling a vehicle is provided, which includes: the battery management system detects the state of the high-voltage battery system; when the state indicates that the high-voltage battery system has a fault level requiring disconnection of a high-voltage relay, the battery management system reports the fault level to the vehicle control unit; and after the front drive motor system stabilizes the high voltage to meet the voltage required by the work of the DC/DC converter, the whole vehicle controller also enables the DC/DC converter and controls the rear drive motor system to perform zero torque control.
Optionally, the fault level requiring opening of the high voltage relay comprises at least one of: the over-discharge of the high-voltage battery system, the over-charge of the high-voltage battery system and the temperature of the high-voltage battery system are higher than a preset threshold value.
Optionally, the method further comprises: the vehicle control unit also sends a torque request to an engine immediately after the vehicle control unit shuts down the rear drive motor system, wherein the torque request includes a compensation torque for a negative torque value of the rear drive motor system at each rotational speed.
Optionally, the method further comprises: in the bus voltage mode, a motor controller of the precursor motor system controls a precursor motor in the precursor motor system to generate power based on a direct current side bus voltage.
Optionally, the method further comprises: and during the period of generating power by the front drive motor in the front drive motor system, the vehicle control unit also prompts the driver that the power system is abnormal at the moment.
Optionally, the method further comprises: and within a preset time after the battery management system reports the fault level, if the battery management system does not receive feedback from the vehicle control unit, the battery management system automatically disconnects the high-voltage relay.
According to a second embodiment of the present disclosure, there is provided a vehicle control system, including: the battery management system is used for detecting the state of the high-voltage battery system and reporting the fault level to the vehicle control unit when the state shows that the fault level of the high-voltage battery system requiring to disconnect the high-voltage relay appears; the vehicle control unit is used for immediately closing a high-voltage air conditioner, high-voltage warm air, a DC/DC converter and a rear-drive motor system after receiving the fault level, synchronously controlling the front-drive motor system to enter a bus voltage mode, controlling the battery management system to disconnect a high-voltage relay, and enabling the DC/DC converter and controlling the rear-drive motor system to perform zero-torque control after the front-drive motor system stabilizes the high voltage to meet the voltage required by the operation of the DC/DC converter.
Optionally, the fault level requiring opening of the high voltage relay comprises at least one of: the over-discharge of the high-voltage battery system, the over-charge of the high-voltage battery system and the temperature of the high-voltage battery system are higher than a preset threshold value.
Optionally, the vehicle control unit further sends a torque request to the engine immediately after the vehicle control unit shuts down the rear-drive electric machine system, wherein the torque request comprises a compensation torque for a negative torque value of the rear-drive electric machine system at each rotation speed.
Optionally, in the bus voltage mode, the motor controller of the precursor motor system controls the precursor motor in the precursor motor system to generate power based on a dc side bus voltage.
Optionally, during the period of power generation of the front drive motor in the front drive motor system, the vehicle control unit also indicates the abnormality of the power system to the driver.
Optionally, within a preset time after the battery management system reports the fault level, if the battery management system does not receive feedback from the vehicle control unit, the battery management system automatically turns off the high-voltage relay.
According to a third embodiment of the present disclosure, a vehicle is provided, which includes the entire vehicle control system according to the second embodiment of the present disclosure.
By adopting the technical scheme, after the high-voltage battery system fails and cannot continuously provide electric energy, the whole vehicle control scheme according to the embodiment of the disclosure enables the front-drive motor system to perform bus voltage control through the cooperation between the battery management system and the whole vehicle controller, and converts the kinetic energy of the engine into high-voltage electric energy for the DC/DC converter to use, namely, at the moment, the vehicle is powered by the engine and generates electricity by the front-drive motor system to work by the DC/DC converter, so that the requirement of low-voltage electricity utilization of the whole vehicle is met, and the vehicle robustness is improved. Moreover, the whole vehicle can be ensured to continue running with certain drivability without interrupting power output, and safety risks caused by power interruption in high-speed working conditions are reduced. In addition, the convenience of using the vehicle by the consumer is improved.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
fig. 1 shows a flowchart of a complete vehicle control method according to an embodiment of the present disclosure.
Fig. 2 shows a schematic block diagram of a vehicle control system according to an embodiment of the present disclosure.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
Fig. 1 shows a flowchart of a complete vehicle control method according to an embodiment of the present disclosure, and as shown in fig. 1, the method includes the following steps S11 to S13.
In step S11, the battery management system detects the state of the high-voltage battery system;
in step S12, when the state indicates that the high-voltage battery system has a fault level requiring disconnection of a high-voltage relay, the battery management system reports the fault level to the vehicle controller;
in step S13, the vehicle control unit immediately turns off the high-voltage air conditioner, the high-voltage warm air, the DC/DC converter, and the rear-drive motor system after receiving the fault level, synchronously controls the front-drive motor system to enter the bus voltage mode, and controls the battery management system to turn off the high-voltage relay, and after the front-drive motor system stabilizes the high voltage to a voltage that meets the requirement of the DC/DC converter for operation, the vehicle control unit further enables the DC/DC converter and controls the rear-drive motor system to perform zero-torque control.
That is, after the vehicle control unit controls the battery management system to disconnect the high-voltage relay, the front-wheel drive motor system enters a bus voltage mode to generate power and perform a high-voltage stabilizing function.
By adopting the technical scheme, after the high-voltage battery system fails and cannot continuously provide electric energy, the whole vehicle control scheme according to the embodiment of the disclosure enables the front-drive motor system to perform bus voltage control through the cooperation between the battery management system and the whole vehicle controller, and converts the kinetic energy of the engine into high-voltage electric energy for the DC/DC converter to use, namely, at the moment, the vehicle is powered by the engine and generates electricity by the front-drive motor system to work by the DC/DC converter, so that the requirement of low-voltage electricity utilization of the whole vehicle is met, and the vehicle robustness is improved. Moreover, the whole vehicle can be ensured to continue running with certain drivability without interrupting power output, and safety risks caused by power interruption in high-speed working conditions are reduced. In addition, the convenience of using the vehicle by the consumer is improved.
Optionally, the fault level requiring opening of the high voltage relay comprises at least one of: the over-discharge of the high-voltage battery system, the over-charge of the high-voltage battery system and the temperature of the high-voltage battery system are higher than a preset threshold value. Because at these fault levels, if the high-voltage battery system continues to operate, danger is brought to the entire vehicle, at these fault levels, the high-voltage relay needs to be disconnected, so that the high-voltage battery system cannot continue to provide electric energy.
In addition, after the high-voltage battery system has a fault level that the high-voltage relay needs to be disconnected, the vehicle control unit closes the rear-drive motor system, and at the moment, the rear-drive motor system needs to perform lower bridge arm short-circuit control. And under the condition of short circuit control of a lower bridge arm, the rear drive motor generates negative torque and generates heat. Therefore, the vehicle control method according to the embodiment of the present disclosure further includes: the vehicle control unit also sends a torque request to an engine immediately after the vehicle control unit shuts down the rear drive motor system, wherein the torque request includes a compensation torque for a negative torque value of the rear drive motor system at each rotational speed. That is, the vehicle control unit needs to calculate a negative torque value of the rear drive motor at each rotation speed in advance, and add a compensation torque for the negative torque value to a torque request of the engine to reduce the influence on the vehicle dynamics.
In addition, since the precursor motor system performs the bus voltage control after the high-voltage battery system has a fault level that requires the high-voltage relay to be disconnected, in the bus voltage mode, the motor controller of the precursor motor system controls the precursor motor in the precursor motor system to generate power based on the dc-side bus voltage, rather than targeting the generated torque as a control target.
In addition, after the vehicle enters the bus voltage mode, the front drive motor system generates power, but the generated power is related to the high-voltage load of the whole vehicle, so that the power cannot be accurately controlled, and the driving comfort may be influenced to a certain extent. In fact, before the high-pressure air conditioner, the high-pressure warm air, the DC/DC converter, the rear drive motor system, and the like are not turned off, or before the generated voltage of the front drive motor system cannot enable the DC/DC converter, the vehicle control unit may indicate to the driver that there is an abnormality in the power system at this time, and may indicate that the power is lost after M seconds, for example, and the driver stops at the side.
Further, within a preset time (for example, 2 seconds or other time) after the battery management system reports the fault level, if the battery management system does not receive feedback from the vehicle control unit, the battery management system automatically turns off the high-voltage relay to ensure driving safety.
Fig. 2 shows a schematic block diagram of a vehicle control system according to an embodiment of the present disclosure, and as shown in fig. 2, the system includes: the battery management system 21 is configured to detect a state of the high-voltage battery system, and report a fault level to the vehicle control unit 22 when the state indicates that the fault level of the high-voltage battery system requires to disconnect the high-voltage relay; the vehicle control unit 22 is configured to, after receiving the fault level, immediately turn off the high-voltage air conditioner, the high-voltage warm air, the DC/DC converter, and the rear-drive motor system, synchronously control the front-drive motor system to enter a bus voltage mode, and control the battery management system 21 to turn off the high-voltage relay, and after the front-drive motor system stabilizes the high voltage to a voltage that meets the operation requirement of the DC/DC converter, the vehicle control unit 22 further enables the DC/DC converter and controls the rear-drive motor system to perform zero-torque control.
By adopting the technical scheme, after the high-voltage battery system fails and cannot continuously provide electric energy, the whole vehicle control scheme according to the embodiment of the disclosure enables the front-drive motor system to perform bus voltage control through the cooperation between the battery management system and the whole vehicle controller, and converts the kinetic energy of the engine into high-voltage electric energy for the DC/DC converter to use, namely, at the moment, the vehicle is powered by the engine and generates electricity by the front-drive motor system to work by the DC/DC converter, so that the requirement of low-voltage electricity utilization of the whole vehicle is met, and the vehicle robustness is improved. Moreover, the whole vehicle can be ensured to continue running with certain drivability without interrupting power output, and safety risks caused by power interruption in high-speed working conditions are reduced. In addition, the convenience of using the vehicle by the consumer is improved.
Optionally, the fault level requiring opening of the high voltage relay comprises at least one of: the over-discharge of the high-voltage battery system, the over-charge of the high-voltage battery system and the temperature of the high-voltage battery system are higher than a preset threshold value.
Optionally, the vehicle control unit 22 further sends a torque request to the engine immediately after the vehicle control unit 22 shuts down the rear drive electric machine system, wherein the torque request includes a compensation torque for a negative torque value of the rear drive electric machine system at each rotational speed.
Optionally, in the bus voltage mode, the motor controller of the precursor motor system controls the precursor motor in the precursor motor system to generate power based on a dc side bus voltage.
Optionally, the vehicle control unit 22 may also indicate to the driver that there is an abnormality in the powertrain at that time during the power generation of the front drive motor system.
Optionally, within a preset time after the battery management system 21 reports the fault level, if the battery management system 21 does not receive feedback from the vehicle control unit 22, the battery management system 21 automatically turns off the high-voltage relay.
According to still another embodiment of the present disclosure, there is provided a vehicle including the entire vehicle control system according to the embodiment of the present disclosure as described above. The vehicle belongs to a hybrid vehicle.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (11)
1. A vehicle control method is characterized by comprising the following steps:
the battery management system detects the state of the high-voltage battery system;
when the state indicates that the high-voltage battery system has a fault level requiring disconnection of a high-voltage relay, the battery management system reports the fault level to the vehicle control unit;
and after the front drive motor system stabilizes the high voltage to meet the voltage required by the work of the DC/DC converter, the whole vehicle controller also enables the DC/DC converter and controls the rear drive motor system to perform zero torque control.
2. The method of claim 1, further comprising:
the vehicle control unit also sends a torque request to an engine immediately after the vehicle control unit shuts down the rear drive motor system, wherein the torque request includes a compensation torque for a negative torque value of the rear drive motor system at each rotational speed.
3. The method of claim 1, further comprising:
in the bus voltage mode, a motor controller of the precursor motor system controls a precursor motor in the precursor motor system to generate power based on a direct current side bus voltage.
4. The method of claim 3, further comprising:
and during the period of generating power by the front drive motor in the front drive motor system, the vehicle control unit also prompts the driver that the power system is abnormal at the moment.
5. The method according to any one of claims 1 to 4, further comprising:
and within a preset time after the battery management system reports the fault level, if the battery management system does not receive feedback from the vehicle control unit, the battery management system automatically disconnects the high-voltage relay.
6. A vehicle control system, characterized in that, the system includes:
the battery management system is used for detecting the state of the high-voltage battery system and reporting the fault level to the vehicle control unit when the state shows that the fault level of the high-voltage battery system requiring to disconnect the high-voltage relay appears;
the vehicle control unit is used for immediately closing a high-voltage air conditioner, high-voltage warm air, a DC/DC converter and a rear-drive motor system after receiving the fault level, synchronously controlling the front-drive motor system to enter a bus voltage mode, controlling the battery management system to disconnect a high-voltage relay, and enabling the DC/DC converter and controlling the rear-drive motor system to perform zero-torque control after the front-drive motor system stabilizes the high voltage to meet the voltage required by the operation of the DC/DC converter.
7. The system of claim 6, wherein the vehicle control unit further sends a torque request to an engine immediately after the vehicle control unit shuts down the rear drive electric machine system, wherein the torque request includes a compensation torque for a negative torque value of the rear drive electric machine system at each rotational speed.
8. The system of claim 6, wherein in the bus voltage mode, a motor controller of the precursor motor system controls a precursor motor in the precursor motor system to generate power based on a dc side bus voltage.
9. The system of claim 8, wherein the vehicle control unit further indicates to the driver that an abnormality exists in the powertrain system during power generation by the front drive motors in the front drive motor system.
10. The system according to any one of claims 6 to 9, wherein within a preset time after the battery management system reports the fault level, if the battery management system does not receive feedback from the vehicle control unit, the battery management system automatically turns off the high-voltage relay.
11. A vehicle characterized by comprising an entire vehicle control system according to any one of claims 6 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910147532.0A CN111619350A (en) | 2019-02-27 | 2019-02-27 | Vehicle control method, vehicle control system and vehicle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910147532.0A CN111619350A (en) | 2019-02-27 | 2019-02-27 | Vehicle control method, vehicle control system and vehicle |
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| CN111619350A true CN111619350A (en) | 2020-09-04 |
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| CN201910147532.0A Pending CN111619350A (en) | 2019-02-27 | 2019-02-27 | Vehicle control method, vehicle control system and vehicle |
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| CN114269617A (en) * | 2020-11-04 | 2022-04-01 | 浙江吉利控股集团有限公司 | Hybrid vehicle and control method and system thereof after battery failure |
| CN114670635A (en) * | 2021-08-16 | 2022-06-28 | 北京新能源汽车股份有限公司 | Vehicle control method and device and electric vehicle |
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