CN114604095A - DC/DC control method and device for new energy automobile - Google Patents
DC/DC control method and device for new energy automobile Download PDFInfo
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- CN114604095A CN114604095A CN202011412577.5A CN202011412577A CN114604095A CN 114604095 A CN114604095 A CN 114604095A CN 202011412577 A CN202011412577 A CN 202011412577A CN 114604095 A CN114604095 A CN 114604095A
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- vehicle
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- new energy
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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
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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
Abstract
The invention relates to a DC/DC control method and a device of a new energy automobile, belonging to the technical field of new energy automobiles, wherein the method comprises the following steps: in the running process of the vehicle, if the storage battery of the vehicle or the low-voltage electricity utilization transient abnormal short circuit of the whole vehicle occurs, the DC/DC is controlled to adjust the output voltage, and the output voltage is reduced in a step manner in at least two stages, so that the DC/DC operates in limited power; and when the DC/DC output voltage is detected to be smaller than the minimum limit value, controlling the DC/DC to stop running. The invention can control the DC/DC to adjust the output voltage and limit the power simultaneously if the transient abnormal short circuit of the low voltage power consumption of the storage battery or the whole vehicle occurs in the running process of the vehicle, thereby ensuring that the vehicle can provide the low voltage power consumption to the whole vehicle to the maximum extent under the condition of the transient abnormal short circuit of the low voltage power consumption of the storage battery or the whole vehicle, improving the fault-tolerant operation capability of the vehicle, enabling a driver to remind the rear vehicle of avoiding in time by operating the vehicle, and improving the safety and the reliability of the vehicle.
Description
Technical Field
The invention belongs to the technical field of new energy automobiles, and particularly relates to a DC/DC control method and device of a new energy automobile.
Background
In a new energy electrical framework, a DC/DC (direct current converter) is mainly used for converting a high direct current voltage of a battery into a low direct current voltage, so that on one hand, a storage battery is charged, on the other hand, low-voltage power supply is provided for a whole vehicle, and normal operation of other equipment is ensured; whether the DC/DC can work reliably and stably is directly related to the safety and reliability of the whole vehicle.
The connection relation between the DC/DC and other equipment in the existing new energy automobile is shown in figure 1, the DC/DC converts the direct current high voltage of the battery into rated low voltage and is connected with the storage battery, and the storage battery is charged when the automobile runs and low-voltage power supply is provided for the whole automobile. If the storage battery or the whole vehicle low-voltage electricity utilization transient abnormal short circuit occurs, the DC/DC output current is increased to the peak current, the DC/DC protection is started, the DC/DC shutdown is controlled, the low-voltage electricity utilization parts of the whole vehicle are also protectively shut down without low-voltage power supply, and therefore the whole vehicle stops running.
The control method has certain potential safety hazard, if the automobile runs on a road or a highway, if the situation that the storage battery or the whole automobile low-voltage power utilization transient abnormal short circuit is generated due to abnormal sudden change of load, the whole automobile stops running, a driver can not control the automobile suddenly, the driver can not remind the rear automobile of avoiding timely, and once the rear automobile can not avoid timely, a safety accident is easily caused.
Disclosure of Invention
The invention aims to provide a DC/DC control method and a DC/DC control device for a new energy automobile, which are used for solving the problem that the existing DC/DC control method is easy to cause safety accidents.
Based on the purpose, the technical scheme of the DC/DC control method of the new energy automobile is as follows:
in the running process of the vehicle, if the storage battery of the vehicle or the low-voltage electricity utilization transient abnormal short circuit of the whole vehicle occurs, the DC/DC is controlled to adjust the output voltage, and the output voltage is reduced in a step manner in at least two stages, so that the DC/DC operates in limited power; and when the DC/DC output voltage is detected to be smaller than the minimum limit value, controlling the DC/DC to stop running.
The technical scheme of the DC/DC control device of the new energy automobile is as follows:
the control method is characterized in that the control unit realizes the DC/DC control method of the new energy automobile when executing the program.
The two technical schemes have the beneficial effects that:
the DC/DC control method and the device can control the DC/DC to adjust the output voltage and limit the power simultaneously if the transient abnormal short circuit of the low-voltage power consumption of the storage battery or the whole vehicle occurs in the running process of the vehicle, ensure that the vehicle can provide the low-voltage power consumption to the whole vehicle to the maximum extent under the condition of the transient abnormal short circuit of the low-voltage power consumption of the storage battery or the whole vehicle, improve the fault-tolerant operation capability of the vehicle, ensure that a driver can prompt the rear vehicle to avoid by operating the vehicle in time, and improve the safety and the reliability of the vehicle.
Further, the step-wise reducing the output voltage comprises:
controlling the DC/DC to adjust the output voltage, reducing the output voltage to a first set value U1, and carrying out early warning prompt, wherein the first set value U1 is smaller than a rated voltage value Un of the DC/DC output;
then, controlling the DC/DC output voltage between a first set value U1 and a second set value U2, wherein U2 is less than U1, controlling the output current of the DC/DC to be adjusted to be less than or equal to a set first protection current I1 by adjusting the output voltage, so that the DC/DC performs power reduction operation, and continuously operating for a first set time t 1;
and then, controlling the DC/DC output voltage between a second set value U2 and a lowest limit value U3, wherein U3 is less than U2, controlling the output current of the DC/DC to be adjusted to be less than or equal to a set second protection current I2 by adjusting the output voltage, and I2 is less than I1, so that the DC/DC performs power reduction operation, and continuously operates for a second set time t 2.
Further, the first set time t1 is greater than the second set time t 2.
Further, when the DC/DC output voltage is detected to be smaller than the minimum limit value, the set time t3 is delayed, and the DC/DC is controlled to stop running.
Drawings
FIG. 1 is a schematic diagram of a low voltage power supply connection in an embodiment of the method of the present invention;
FIG. 2 is a flow chart of a DC/DC control method in an embodiment of the method of the present invention;
FIG. 3 is a schematic diagram of a two-stage ladder strategy in an embodiment of the method of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
The method comprises the following steps:
the embodiment provides a DC/DC control method for a new energy vehicle, as shown in fig. 2, the specific control steps are as follows:
when the vehicle normally runs, the DC/DC is controlled to convert the direct current high voltage of the power battery into low voltage with a certain rated voltage (for example, 27.8V), so that the storage battery is charged, and meanwhile, the low voltage power supply is provided for the whole vehicle.
In the running process of a vehicle, controlling the DC/DC to convert the high direct voltage of the battery into low voltage with rated voltage Un being 27.8V, if the low voltage electricity consumption of the storage battery or the whole vehicle is in transient abnormal short circuit, detecting that the output current of the DC/DC is increased to peak current (higher than 180A), and reducing the output voltage of the DC/DC, so that the occurrence of the transient abnormal short circuit is judged, controlling the DC/DC to adjust the output voltage, reducing the output voltage to a first set value U1, and giving an early warning prompt. For example, the output voltage drop of the control DC/DC is 19V.
After that, the DC/DC output voltage is controlled between the first set value U1 and the second set value U2, U2< U1, for example, 19V to 17V, the output current of the DC/DC is controlled to be less than or equal to the first protection current I1, for example, I1 ═ 80A, by adjusting the output voltage, the DC/DC is subjected to the power reduction operation, and the operation is continued for the first set time t1, for example, for 2min, so as to improve the load sudden change adaptability.
During the continuous operation of the vehicle, the output voltage of the DC/DC is controlled between a second set value U2 and a minimum value U3, U3< U2, for example, between 17V and 14V, the output current of the DC/DC is controlled to be adjusted to be less than or equal to a second protection current I2, I2< I1, for example, I2-40A, the DC/DC is subjected to power reduction operation, the operation is continued for a second set time t2, for example, 30s, and the load sudden change adaptability is improved.
And then, when the vehicle is continuously operated and the DC/DC output voltage is detected to be smaller than the minimum limit value, for example, smaller than 14V, the delay set time t3 is 2s, the DC/DC is controlled to stop running, and the low-voltage power utilization is provided for the whole vehicle to the maximum extent according to the step-type strategy under the condition that the vehicle is short-circuited due to the transient abnormal low-voltage power utilization of the storage battery or the whole vehicle, so that the safety and the reliability of the vehicle are improved. The above staircase strategy is illustrated in fig. 3, where the horizontal axis represents the DC/DC output voltage and the vertical axis represents the DC/DC output current.
In this embodiment, the reason why the first setting time t1 for the first stage operation is set to be longer than the second setting time t2 for the second stage operation in the two stages of stepwise decreasing the output voltage of the DC/DC voltage is that the control voltage in the second stage is lower than the control voltage in the first stage, and the sudden change adaptability of the load in the second stage is stronger than that in the first stage, and therefore, the second setting time t2 is shorter than the first setting time t 1.
The DC/DC control method can control the DC/DC to adjust the output voltage and limit the power at the same time if the storage battery or the whole vehicle is subjected to the transient abnormal short circuit of the low-voltage power utilization in the running process of the vehicle, the output voltage, the output current and the running time are processed according to a two-stage step-type strategy shown in figure 3, and finally the vehicle is stopped in a delayed mode, so that the low-voltage power utilization can be provided for the whole vehicle to the maximum extent under the condition that the storage battery or the whole vehicle is subjected to the transient abnormal short circuit of the low-voltage power utilization, the fault-tolerant running capability of the vehicle is improved, a driver can prompt the vehicle behind to avoid by operating the vehicle, and the safety and the reliability of the vehicle are improved.
In other embodiments, a three-stage or more ladder-type strategy may be provided to control the DC/DC to reduce the output voltage and to operate the DC/DC limited power. For example, a three-stage step-type strategy is set, the voltage ranges of the adjustment in the first stage, the second stage and the third stage are sequentially reduced, the set first protection current, the set second protection current and the set third protection current are also sequentially reduced, and finally, if the DC/DC output voltage is lower than the minimum limit value, the shutdown is immediately or in a delayed control mode.
The embodiment of the device is as follows:
the embodiment provides a DC/DC control device for a new energy automobile, which includes a memory, a processor, and a computer program stored in the memory and running on the processor, where the processor is coupled to the memory, and is used to run program instructions stored in the memory to implement the DC/DC control method in the method embodiment.
That is, the methods in the above method embodiments should be understood that the flow of the control method may be implemented by computer program instructions. These computer program instructions may be provided to a processor (e.g., a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus), such that the instructions, which execute via the processor, create means for implementing the functions specified in the method flow.
Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (5)
1. A DC/DC control method of a new energy automobile is characterized by comprising the following steps:
in the running process of the vehicle, if the storage battery of the vehicle or the low-voltage electricity utilization transient abnormal short circuit of the whole vehicle occurs, the DC/DC is controlled to adjust the output voltage, and the output voltage is reduced in a step manner in at least two stages, so that the DC/DC operates in limited power; and when the DC/DC output voltage is detected to be smaller than the minimum limit value, controlling the DC/DC to stop running.
2. The DC/DC control method of the new energy vehicle according to claim 1, wherein the step-wise decreasing the output voltage includes:
controlling the DC/DC to adjust the output voltage, reducing the output voltage to a first set value U1, and carrying out early warning prompt, wherein the first set value U1 is smaller than a rated voltage value Un of the DC/DC output;
then, controlling the DC/DC output voltage between a first set value U1 and a second set value U2, wherein U2 is less than U1, controlling the output current of the DC/DC to be adjusted to be less than or equal to a set first protection current I1 by adjusting the output voltage, so that the DC/DC performs power reduction operation, and continuously operating for a first set time t 1;
and then, controlling the DC/DC output voltage between a second set value U2 and a lowest limit value U3, wherein U3 is less than U2, controlling the output current of the DC/DC to be adjusted to be less than or equal to a set second protection current I2 by adjusting the output voltage, and I2 is less than I1, so that the DC/DC performs power reduction operation, and continuously operates for a second set time t 2.
3. The DC/DC control method for the new energy automobile according to claim 2, wherein the first set time t1 is greater than the second set time t 2.
4. The DC/DC control method for the new energy automobile according to any one of claims 1-3, wherein when the DC/DC output voltage is detected to be less than the minimum limit value, the set time t3 is delayed, and the DC/DC is controlled to stop running.
5. A DC/DC control apparatus of a new energy vehicle, characterized by comprising a control unit, and a program stored on and run on the control unit, the control unit implementing the DC/DC control method of the new energy vehicle according to any one of claims 1 to 4 when executing the program.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011412577.5A CN114604095B (en) | 2020-12-03 | 2020-12-03 | DC/DC control method and device for new energy automobile |
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| CN202011412577.5A CN114604095B (en) | 2020-12-03 | 2020-12-03 | DC/DC control method and device for new energy automobile |
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| CN114604095A true CN114604095A (en) | 2022-06-10 |
| CN114604095B CN114604095B (en) | 2023-07-21 |
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| CN114604095B (en) | 2023-07-21 |
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Address after: No. 6, Yutong Road, Guancheng Hui District, Zhengzhou, Henan 450061 Applicant after: Yutong Bus Co.,Ltd. Address before: No.1, Shibali Heyu Road, Guancheng Hui District, Zhengzhou City, Henan Province Applicant before: ZHENGZHOU YUTONG BUS Co.,Ltd. |
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