CN114919425A - Automobile starting control method, device, equipment and storage medium - Google Patents
Automobile starting control method, device, equipment and storage medium Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 claims abstract description 37
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- 238000001514 detection method Methods 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 9
- 230000003247 decreasing effect Effects 0.000 claims description 2
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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
- B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
- B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
- B60L15/2072—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed for drive off
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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
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
- B60L58/27—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
- B60W30/18—Propelling the vehicle
- B60W30/18009—Propelling the vehicle related to particular drive situations
- B60W30/18027—Drive off, accelerating from standstill
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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
- B60L2240/42—Drive Train control parameters related to electric machines
- B60L2240/423—Torque
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2710/00—Output or target parameters relating to a particular sub-units
- B60W2710/08—Electric propulsion units
- B60W2710/083—Torque
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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)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Automation & Control Theory (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The application relates to an automobile starting control method, an automobile starting control device, automobile starting control equipment and a storage medium. The automobile starting control method comprises the following steps: monitoring a first peak power and a second peak power in the starting process of the automobile, wherein the first peak power is the available peak power of the automobile, and the second peak power is the peak power required by the automobile; comparing the first peak power and the second peak power; and under the condition that the first peak power is smaller than the second peak power, setting the torque upper limit of the motor according to the first peak power, and limiting the torque of the motor according to the torque upper limit. By adopting the method, the problem of starting jitter of the automobile in a low-temperature environment can be effectively solved.
Description
Technical Field
The application relates to the technical field of automatic control of automobiles, in particular to an automobile starting control method, an automobile starting control device, automobile starting control equipment and a storage medium.
Background
The discharge capacity of the battery of the new energy automobile is easily affected by the ambient temperature. Particularly, under a low-temperature environment, the discharge power of the battery is low, so that the automobile shakes when a driver starts a large throttle.
In this regard, the battery may be heated prior to vehicle launch, but this method is time consuming and may reduce the efficiency of vehicle launch.
Therefore, a starting control method for improving the starting jitter problem of the automobile in a low-temperature environment is also lacked.
Disclosure of Invention
Therefore, the method, the device, the equipment and the storage medium for controlling the starting of the automobile are provided, and the problem of starting shake of the automobile in a low-temperature environment is solved.
In a first aspect, the present application provides a method for controlling a vehicle to start, including: monitoring a first peak power and a second peak power in the starting process of the automobile, wherein the first peak power is the available peak power of the automobile, and the second peak power is the peak power required by the automobile, namely the power required when the torque of the motor reaches the maximum value (external characteristics of the motor); comparing the magnitude of the first peak power and the magnitude of the second peak power; and under the condition that the first peak power is smaller than the second peak power, setting a torque upper limit of the motor according to the first peak power, and limiting the torque of the motor according to the torque upper limit of the motor.
With reference to the first aspect, in a first implementation manner of the first aspect, the setting of the upper torque limit of the motor according to the first peak power includes: monitoring the rotating speed of the motor at the current moment; and obtaining the peak torque at the rotating speed of the motor according to the first peak power, and taking the peak torque as the upper torque limit of the motor.
With reference to the first aspect, in a second implementation manner of the first aspect, the setting of the upper torque limit of the motor according to the first peak power includes: acquiring a torque gradient table corresponding to the first peak power, wherein the torque gradient table is used for indicating at least one peak torque which is reduced in gradient along with the increase of the rotating speed of the motor; and setting the upper limit of the motor torque according to the peak torque from large to small in the torque gradient table.
With reference to the first aspect, in a third implementation manner of the first aspect, before monitoring the first peak power and the second peak power in the vehicle starting process, the method further includes: before the automobile starts, detecting the temperature of a battery, and acquiring a preset safe torque as an upper limit of the motor torque under the condition that the temperature of the battery is less than a preset temperature; and under the condition that the first peak power is monitored to be smaller than the second peak power, setting the upper limit of the motor torque according to the first peak power, and limiting the torque of the motor according to the upper limit of the motor torque.
With reference to the first aspect, in a fourth implementation manner of the first aspect, when the first peak power is smaller than the second peak power, the method further includes: monitoring the temperature of the battery; and under the condition that the temperature of the battery is lower than the preset temperature, heating the battery until the first peak power is greater than or equal to the second peak power.
With reference to the first aspect, in a fifth implementation manner of the first aspect, the monitoring a first peak power of an automobile includes: monitoring the peak power of the battery and the peak power of the range extender; the sum of the peak power of the battery and the peak power of the range extender is taken as the first peak power.
With reference to the first aspect, in a sixth implementation manner of the first aspect, the monitoring a second peak power of the automobile includes: acquiring an external characteristic curve of the automobile in a normal-temperature environment, and monitoring the motor rotating speed at the current moment; and determining the peak power of the automobile at the motor speed according to the external characteristic curve, and taking the peak power as a second peak power.
In a second aspect, the present application further provides a vehicle starting control device, including: the detection unit is used for monitoring a first peak power and a second peak power in the starting process of the automobile, wherein the first peak power is the peak power available for the automobile, and the second peak power is the peak power required by the automobile; the comparison unit is used for comparing the magnitude of the first peak power and the magnitude of the second peak power; and the control unit is used for setting the upper torque limit of the motor according to the first peak power and limiting the torque of the motor according to the upper torque limit of the motor under the condition that the first peak power is smaller than the second peak power.
With reference to the second aspect, in a first implementation manner of the second aspect, the control unit is specifically configured to: monitoring the rotating speed of the motor at the current moment; and obtaining the peak torque under the rotating speed of the motor according to the first peak power, and taking the peak torque as the upper torque limit of the motor.
With reference to the second aspect, in a second implementation manner of the second aspect, the control unit is specifically configured to: acquiring a torque gradient table corresponding to the first peak power, wherein the torque gradient table is used for indicating at least one peak torque which is reduced in gradient along with the increase of the rotating speed of the motor; and setting the upper limit of the motor torque according to the peak torque from large to small in the torque gradient table.
With reference to the second aspect, in a third implementation manner of the second aspect, the detection unit is further configured to detect a battery temperature before the vehicle starts; and the control unit is also used for acquiring a preset safe torque as an upper limit of the motor torque under the condition that the temperature of the battery is less than the preset temperature, setting the upper limit of the motor torque according to the first peak power and limiting the torque of the motor according to the upper limit of the motor torque under the condition that the first peak power is monitored to be less than the second peak power.
With reference to the second aspect, in a fourth implementation manner of the second aspect, the detection unit is further configured to monitor a battery temperature; the automobile starting control device further comprises a heating unit, wherein the heating unit is used for heating the battery under the condition that the temperature of the battery is lower than the preset temperature until the first peak power is larger than or equal to the second peak power.
With reference to the second aspect, in a fifth implementation manner of the second aspect, the detection unit is specifically configured to monitor a peak power of the battery and a peak power of the range extender; the sum of the peak power of the battery and the peak power of the range extender is taken as the first peak power.
With reference to the second aspect, in a sixth implementation manner of the second aspect, the detection unit is specifically configured to obtain an external characteristic curve of the automobile in a normal temperature environment, and monitor a motor rotation speed at a current time; and determining the peak power of the automobile at the motor speed according to the external characteristic curve, and taking the peak power as a second peak power.
In a third aspect, the application also provides an automobile starting control device, which comprises a processor and a memory, wherein the processor is connected with the memory through a bus; a processor for executing a plurality of instructions; a storage medium storing a plurality of instructions adapted to be loaded by a processor and to perform a method of vehicle launch control as described in the first aspect or any one of the embodiments of the first aspect.
In a fourth aspect, the present application further provides a computer-readable storage medium having stored therein a plurality of instructions adapted to be loaded by a processor and execute the method for controlling vehicle start according to the first aspect or any one of the embodiments of the first aspect.
In the embodiment of the application, an automobile starting control device firstly and respectively monitors available peak power and required peak power in the automobile starting process to obtain first peak power and second peak power; then comparing the first peak power with the second peak power, if the first peak power is smaller than the second peak power, it indicates that the peak power provided by the automobile cannot meet the requirement of starting a large throttle of the automobile, so the torque upper limit of the motor is set according to the first peak power, and the torque of the motor is limited according to the torque upper limit of the motor; if the first peak power is larger than or equal to the second peak power, the peak power provided by the automobile can meet the requirement of starting the automobile by a large throttle, so that the torque of the motor is limited by taking the peak torque in the external characteristic curve of the automobile in the normal temperature environment as the upper limit of the torque of the motor without excessively limiting the torque of the motor. Therefore, the available peak power and the required peak power in the automobile starting process are monitored in real time, the upper limit of the motor torque of the automobile is dynamically and smoothly changed, the automobile is prevented from being reduced to be low torque at once from high torque during large throttle starting due to over-discharge protection of a battery, the condition of automobile shaking is reduced, and the automobile starting efficiency is effectively improved.
Drawings
FIG. 1 is a schematic flow chart diagram of a vehicle launch control method according to one embodiment;
FIG. 2 is a schematic flow chart of a vehicle start control method according to another embodiment;
FIG. 3 is a schematic block diagram of a vehicle launch control apparatus provided herein;
fig. 4 is a structural block diagram of an automobile starting control device provided by the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.
It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated. The structures, proportions, sizes, and other dimensions shown in the drawings and described in the specification are for understanding and reading the present disclosure, and are not intended to limit the scope of the present disclosure, which is defined in the claims, and are not essential to the art, and any structural modifications, changes in proportions, or adjustments in size, which do not affect the efficacy and attainment of the same are intended to fall within the scope of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are used for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms may be changed or adjusted without substantial change in the technical content.
It should be further noted that the Vehicle starting Control device and the Vehicle starting Control device related to the present application may include, but are not limited to, a Control system of a whole Vehicle, a Vehicle drive controller, a Vehicle Control Unit (VCU), an Electronic Control Unit (ECU), and the like, and the Vehicle starting Control device may implement the method described in the present application, for example, peak power of a battery, a battery temperature, and peak power of a range extender may be monitored by other components, and torque of a motor is limited according to an upper limit of torque of the motor, and the present application is not repeated herein.
The discharge capacity of the battery of the new energy automobile is easily affected by the ambient temperature. Under the normal temperature environment, the battery discharge capacity is normal, and the power provided by the battery can meet the requirement of automobile starting. However, in a low-temperature environment, the discharge capacity of the battery is abnormal, and the power provided by the battery may not meet the requirement of starting the automobile. The inventor researches and discovers that: when the automobile starts with a large throttle in a low-temperature environment, the high torque requested by the large throttle is in conflict with the small torque provided by the over-discharge protection of the battery, and the torque of the automobile may be suddenly reduced from the high torque to the low torque, so that the automobile shakes. At present, in order to solve the problem in the low-temperature starting process of the automobile, the battery can be heated before the automobile is started, but the method is time-consuming and can reduce the starting efficiency of the automobile.
Therefore, the method for controlling the automobile starting is provided, the available peak power and the required peak power in the automobile starting process are monitored in real time, the upper limit of the motor torque of the automobile is dynamically and smoothly adjusted, the situation that the automobile is subjected to shaking due to the fact that the high torque is reduced to the low torque at once when the automobile is started from a large throttle because of over-discharge protection of a battery is prevented, and accordingly the situation that the automobile shakes is reduced.
It should be noted that the following "monitoring" refers to that the vehicle start control device performs detection according to a preset frequency, and the monitoring process includes at least one detection operation, wherein the preset frequency is an arbitrary constant value set in advance. The automobile starting control device can continuously execute detection operation in the monitoring process until a preset trigger condition is detected, and execute the next step, such as: and when the automobile starting control device detects that the first peak power is smaller than the second peak power, the upper limit of the torque of the motor is set according to the first peak power. The step of setting the upper limit of the motor torque according to the first peak power is the next step executed when the trigger condition is detected.
In addition, the "current time" to be mentioned below refers to a corresponding time node when the trigger condition is satisfied, for example: and when the automobile starting control device sets the upper limit of the motor torque according to the first peak power, detecting the rotating speed of the motor at the current moment (the current moment is a time node corresponding to the trigger condition that the first peak power is detected to be smaller than the second peak power), obtaining the peak torque at the rotating speed of the motor according to the first peak power, and taking the peak torque as the upper limit of the motor torque. It should be noted that, in practical application, there may be a time difference between the time node corresponding to the trigger condition and the time node for detecting the rotation speed of the motor, but the time difference is small, so that the time difference can be considered to be ignored, and the current time is approximately equal to the time node corresponding to the trigger condition, which will not be described herein below.
Next, the automobile starting control method provided by the application will be described in detail with reference to an application scenario of low-temperature starting of a new energy automobile and with an automobile starting control device as an execution main body.
Firstly, monitoring a first peak power and a second peak power in the automobile starting process in real time by an automobile starting control device, wherein the first peak power is the peak power available for an automobile, namely the maximum discharge power which can be reached by a power supply in a short time; the second peak power is a peak power required by the vehicle, that is, a power required when the torque of the motor reaches a maximum value (an external characteristic of the motor).
In order to monitor the first peak power, the vehicle starting control device may monitor the peak power of the battery and the peak power of the range extender, and use the sum of the peak power of the battery and the peak power of the range extender as the first peak power. The peak power of the Battery may be monitored by a Battery Management System (BMS), and the peak power of the range extender may be monitored by a range extender control System.
In order to monitor the second peak power, the vehicle starting control device may first obtain an external characteristic curve of the vehicle in a normal temperature environment, and monitor the motor speed at the current moment. And then determining the peak power of the automobile at the motor speed of the current moment according to the external characteristic curve, and taking the peak power as a second peak power. It should be noted that the external characteristic curve in the normal temperature environment refers to a curve in which the torque of the engine in the full load state (the gasoline engine is fully opened at the throttle) measured in the normal temperature environment changes with the rotation speed, so that the torque corresponding to the rotation speed of the motor can be found by directly looking up a table in the external characteristic curve, and the peak power (P ═ T N/9550, where P is the peak power in kilowatt KW, T is the torque in newton meters N · m, and N is the rotation speed of the motor in rpm/min) can be obtained from the torque and the rotation speed of the motor, and the peak power is taken as the second peak power. The torque in the outer characteristic curve has a stable value and a small value floating range, wherein the peak torque is the upper limit value of the value range, and the valley torque is the lower limit value of the value range.
Then, the automobile starting control device compares the first peak power and the second peak power, and sets the upper limit of the motor torque according to the first peak power under the condition that the first peak power is smaller than the second peak power, so that the maximum torque of the automobile does not exceed the upper limit of the motor torque. And otherwise, if the first peak power is larger than or equal to the second peak power, taking a preset default torque as the upper limit of the torque of the motor, wherein the default torque comprises the peak torque in the external characteristic curve under the normal temperature environment. Optionally, under the condition that the temperature of the battery is lower than the preset temperature, the vehicle starting control device may further monitor the temperature of the battery, and if the temperature of the battery is lower than the preset temperature, the battery is heated until the first peak power is greater than or equal to the second peak power.
As an implementable manner, when the upper limit of the motor torque is set according to the first peak power, the upper limit of the motor torque may be adjusted in real time according to the motor rotation speed at the current time, specifically: monitoring the rotating speed of the motor at the current moment; and obtaining the peak torque at the rotating speed of the motor according to the first peak power, and taking the peak torque as the upper torque limit of the motor.
In the embodiment of the application, the automobile starting control device adjusts the upper limit of the motor torque in real time according to the motor rotating speed at the current moment, so that the problem of jitter of an automobile in the low-temperature starting process is solved. This is because: through the monitoring process, the situation that the available peak power of the automobile is insufficient can be found in time, and the upper limit of the motor torque of the automobile is adjusted in time, so that the adjusting process of the upper limit of the motor torque becomes relatively smooth; since the adjustment process becomes relatively smooth, the upper torque limit of the motor cannot be adjusted from a high value to a low value, so that the vehicle cannot suddenly shake.
Although the above real-time adjustment of the upper limit of the motor torque improves the problem of jitter during low-temperature starting of the automobile, very slight jitter may still exist during multiple adjustments, because in practical applications, the monitoring process of the motor rotation speed cannot achieve a perfect real-time effect. There is a minimal delay in time between each operation to adjust the upper motor torque limit. The motor speed may momentarily rise a step in this slight delay, so that the problem of very slight jerking may occur during multiple adjustments.
In order to improve the problem that the very slight shaking can occur in the process of adjusting for a plurality of times, the application also provides a preferable mode, namely a table lookup is used for adjusting the upper torque limit of the motor. Specifically, the method comprises the following steps: the automobile starting control device acquires a torque gradient table corresponding to the first peak power, wherein the torque gradient table is used for indicating at least one peak torque which is reduced in gradient along with the increase of the rotating speed of the motor; and setting the upper limit of the motor torque according to the peak torque from large to small in the torque gradient table. And the torque gradient tables corresponding to the monitored first peak power are different according to different monitored values of the first peak power. The peak torques in the torque gradient table are arranged from large to small according to the magnitude of the value, wherein the maximum peak torque is the maximum torque which can be provided by the automobile under the first peak power which is monitored. When the motor torque upper limit is set according to the torque gradient table, the automobile starting control device sets the motor torque upper limit in sequence from the maximum torque in the torque gradient table to the minimum torque.
In the embodiment of the application, the automobile starting control device omits the process of monitoring the rotating speed of the motor in real time, directly obtains the torque gradient table corresponding to the first peak power, and directly sets the upper limit of the torque of the motor according to the torque gradient table, so that the extremely small delay in the embodiment can hardly exist, and the problem that the motor is likely to shake slightly in the multiple adjusting processes is solved. Specifically, the torque gradient table comprises a plurality of peak torques, the difference value between every two adjacent peak torques is smaller than a preset difference value, the preset difference value is the minimum difference value for generating extremely slight jitter, when the difference value exceeds the preset difference value, the automobile can generate extremely slight jitter which can be sensed by passengers, and otherwise, the difference value is not generated. Therefore, the torque gradient meter is adopted to adjust the upper limit of the motor torque, so that the problem that the motor torque of the automobile is slightly jittered in multiple adjusting processes is solved by smoothly adjusting the upper limit of the motor torque of the automobile.
For example, when the vehicle starting control device monitors that the first peak power is smaller than the second peak power, a torque gradient table corresponding to the first peak power is obtained, and the torque gradient table comprises a plurality of peak torques (L1, L2.. LN..). The automobile starting control device sequentially sets L1 and L2.
Although the above preferred mode improves the problem that the very slight shake may occur during the adjustment, the very slight shake may occur during the initial adjustment because there is a very slight delay in time between the vehicle start control apparatus first monitoring that the first peak power is smaller than the second peak power and setting the upper limit of the motor torque according to the first peak power. The motor speed may momentarily increase by one step in this slight delay. If the upper limit of the motor torque calculated according to the motor speed at the current moment is limited, the problem of slight jitter may occur.
In order to improve the problem of extremely light micro-jitter that probably produces when adjusting for the first time, the technical effect of this application is further promoted, this application has still provided an optimization method. The optimization method specifically comprises the following steps: the automobile starting control device detects the temperature of a battery before the automobile starts, and acquires a preset safe torque as the upper limit of the torque of the motor under the condition that the temperature of the battery is less than the preset temperature; and under the condition that the first peak power is monitored to be smaller than the second peak power, executing the steps of setting the upper torque limit of the motor according to the first peak power and limiting the torque of the motor according to the upper torque limit of the motor.
In the embodiment of the application, before the automobile is started, the automobile starting control device pre-judges whether the situation that the available peak power is insufficient may exist in the starting process of the automobile, wherein the preset temperature can be normal temperature or slightly lower than the normal temperature; the safe torque is an arbitrary value smaller than the valley torque. Because the safe torque is less than the valley torque for the motor torque upper limit when safe torque is less than the initial adjustment, the motor torque upper limit when the initial adjustment is promptly: and the upper limit of the motor torque is set according to the first peak power when the motor is adjusted for the first time. Therefore, when the motor torque upper limit of the automobile is adjusted from a smaller safe torque to a larger motor torque upper limit at the first adjustment, the shaking cannot occur, and the problem of slight shaking which may occur at the first adjustment is solved.
For example, according to an external characteristic curve in a normal temperature environment, assuming that a safe torque, that is, a valley torque is M1, the vehicle start control device sets an upper limit of the motor torque to M2 during a first adjustment, and M1 is smaller than M2. Therefore, when the automobile starting control device monitors that the first peak power is smaller than the second peak power for the first time, the automobile starting control device adjusts the upper limit of the motor torque of the automobile from smaller M1 to larger M2, and the automobile does not shake at the moment.
In conclusion, the automobile starting control device monitors the available peak power and the required peak power in the automobile starting process in real time, dynamically and smoothly changes the upper limit of the motor torque of the automobile, and prevents the high torque from being reduced to the low torque at once when the automobile starts from a large throttle due to the over-discharge protection of a battery, so that the condition of automobile shaking is reduced, and the automobile starting efficiency is effectively improved.
Based on the above detailed description about the application scenario of the present application, the present application will describe the vehicle starting control method in more detail with reference to the flowchart of fig. 1. Specifically, the method comprises the following steps:
101: and monitoring the first peak power and the second peak power in the starting process of the automobile.
In the embodiment of the present application, as the vehicle starts to move, the motor rotation speed increases from zero, and the peak power required by the vehicle also increases. In order to prevent the situation, the automobile starting control device monitors a first peak power and a second peak power in the automobile starting process according to a higher preset frequency until the first peak power is smaller than the second peak power, and executes the subsequent step of adjusting the upper limit of the motor torque. The first peak power is the peak power available to the vehicle, and the second peak power is the peak power required by the vehicle, that is, the power required when the torque of the motor reaches the maximum value (the external characteristic of the motor).
In order to monitor the first peak power, the vehicle start control device may monitor the peak power of the battery through the BMS and use the peak power of the battery as the first peak power, or further monitor the peak power of the range extender through the range extender control system and use the sum of the peak power of the battery and the peak power of the range extender as the first peak power.
In order to monitor the second peak power, the automobile starting control device can acquire an external characteristic curve of the automobile in a normal-temperature environment and monitor the motor rotating speed at the current moment; and determining the peak power of the automobile at the motor speed according to the external characteristic curve, and taking the peak power as a second peak power. The determination of the peak power of the vehicle at the motor speed from the external characteristic curve means: the torque of the automobile at the motor speed at the current moment is searched in the external characteristic curve, and the torque and the motor speed are multiplied and divided by 9550 to obtain peak torque. The external characteristic curve represents a mapping relationship between the torque of the vehicle and the motor speed at the full engine load state.
102: and comparing the first peak power and the second peak power.
In the embodiment of the present application, in the process of monitoring the first peak power and the second peak power, the vehicle start control device compares the magnitudes of the first peak power and the second peak power each time the first peak power and the second peak power are detected, and if the first peak power is greater than or equal to the second peak power, continues to detect the first peak power and the second peak power until the first peak power is detected to be smaller than the second peak power, and then executes the next step, for example, step 103.
103: and when the first peak power is smaller than the second peak power, setting a torque upper limit of the motor according to the first peak power, and limiting the torque of the motor according to the torque upper limit of the motor.
In the embodiment of the present application, when the first peak power is smaller than the second peak power, the vehicle start control device sets the motor torque upper limit based on the first peak power, and limits the torque of the motor based on the motor torque upper limit, that is, controls the torque of the vehicle not to exceed the motor torque upper limit. On the contrary, in the case that the first peak power is greater than or equal to the second peak power, a preset default torque is set as the upper limit of the motor torque, the default torque includes a peak torque in the external characteristic curve in the normal temperature environment, and the step 101 is continuously executed until the first peak power is detected to be smaller than the second peak power. The method for setting the upper limit of the motor torque according to the first peak power comprises two modes: in the first mode, the upper limit of the motor torque is adjusted in real time; in the second mode, the upper limit of the motor torque is adjusted by looking up a table. Specifically, the method comprises the following steps:
in the first mode, the upper limit of the motor torque is adjusted in real time: the automobile starting control device monitors the motor rotating speed at the current moment; and obtaining the peak torque under the rotating speed of the motor according to the first peak power, and taking the peak torque as the upper torque limit of the motor.
In the first mode, the automobile starting control device monitors and obtains the motor torque at the current moment in real time, and the ratio of the first peak power to the motor torque is used as the upper limit of the motor torque. The ratio of the first peak power to the motor torque is the peak torque which can be provided by the automobile at the motor speed. In addition, since the motor torque is monitored in real time in the present embodiment, the peak torque at the corresponding time is monitored at different times, and the peak torque at the corresponding time is set as the upper limit of the motor torque at different times, so as to control the torque of the vehicle. Therefore, the method can adjust the upper limit of the motor torque of the automobile in time through the real-time monitoring process, the adjusting process becomes relatively smooth, the upper limit of the motor torque cannot be adjusted to be very low from a very high numerical value, and the problem of sudden shaking of the automobile is solved.
In the second mode, the upper limit of the motor torque is adjusted by looking up a table: the automobile starting control device acquires a torque gradient table corresponding to the first peak power, and the torque gradient table is used for indicating at least one peak torque which is decreased in gradient along with the increase of the rotating speed of the motor; and setting the upper limit of the motor torque according to the peak torque from large to small in the torque gradient table.
In the second aspect, the vehicle start control device sets the motor torque upper limit on the basis of the torque gradient table corresponding to the first peak power. The first peak powers with different values correspond to different torque gradient tables. The torque gradient table is used for indicating at least one peak torque which is reduced in gradient along with the increase of the rotating speed of the motor, and the at least one peak torque is used for indicating the maximum torque which can be provided by the automobile at different moments. The peak torques in the torque gradient table are arranged from large to small according to the magnitude of the values, wherein the maximum peak torque is the maximum torque which can be provided by the automobile under the first peak power monitored. When the motor torque upper limit is set according to the torque gradient table, the automobile starting control device sets the motor torque upper limit in sequence from the maximum torque in the torque gradient table to the minimum torque. It should be noted that, because the process of monitoring the motor rotation speed in real time is saved in this mode, the upper limit of the motor torque is directly set according to the preset torque gradiometer, so that the technical effect is further improved, and the problem that the motor may shake slightly in the multiple adjustment process is solved.
In an implementable manner, before the automobile starts, the automobile starting control device detects the temperature of a battery, and acquires a preset safe torque as an upper limit of the torque of the motor under the condition that the temperature of the battery is less than a preset temperature; and under the condition that the first peak power is monitored to be smaller than the second peak power, the step of setting the upper torque limit of the motor according to the first peak power and limiting the torque of the motor according to the upper torque limit of the motor is executed.
In the embodiment of the application, before the automobile is started, the automobile starting control device pre-judges whether the situation that the available peak power is insufficient may exist in the starting process of the automobile, wherein the preset temperature can be normal temperature or slightly lower than the normal temperature; the safe torque is an arbitrary value smaller than the valley torque. It should be noted that, when the vehicle starting control device is adjusted for the first time, the motor torque upper limit of the vehicle is adjusted from a smaller safe torque to a larger motor torque upper limit, and therefore the problem of extremely slight shake which may be generated when the motor torque upper limit is adjusted for the first time is solved, and the technical effect of the application is further improved.
In an implementation manner, the vehicle starting control device may further monitor the temperature of the battery when the first peak power is less than the second peak power, and heat the battery when the temperature of the battery is less than a preset temperature until the first peak power is greater than or equal to the second peak power.
In the embodiment of the application, the vehicle starting control device may further monitor the battery temperature when the first peak power is less than the second peak power, and if the battery temperature is less than the preset temperature, it indicates that the battery is in a low-temperature state and cannot provide enough peak power, so that the battery is heated until the first peak power is greater than or equal to the second peak power, the problem of vehicle shake is fundamentally solved, and the technical effect of shake prevention is further enhanced.
In conclusion, under the condition that enough peak power cannot be provided in the automobile starting process, the automobile starting control device dynamically and smoothly changes the upper limit of the motor torque of the automobile according to the available peak power of the automobile in real time, so that the condition of automobile shaking is reduced, and the automobile starting efficiency is effectively improved.
In order to more clearly illustrate the vehicle starting control method, the application also provides another practical mode. Next, the present application will be described with reference to the flowchart shown in fig. 2. Specifically, the method comprises the following steps:
201: before the automobile starts, the battery temperature is detected, and under the condition that the battery temperature is lower than the preset temperature, the preset safe torque is obtained and used as the upper limit of the motor torque.
Before the automobile starts, the automobile starting control device monitors the battery temperature of the battery through the BMS or the temperature sensor and the like, and if the battery temperature is lower than the preset temperature, the preset safe torque is obtained to serve as the upper limit of the motor torque, so that the torque of the automobile does not exceed the safe torque. Otherwise, if the battery temperature is greater than or equal to the preset temperature, the upper limit of the motor torque is not set before starting, and step 202 is executed after the automobile is started so as to monitor the first peak power and the second peak power. The preset temperature can be a normal temperature or any value slightly lower than the normal temperature, and the safe torque is any value smaller than the valley torque.
202: and monitoring the first peak power and the second peak power in the starting process of the automobile.
In the embodiment of the application, the automobile starting control device monitors the first peak power and the second peak power in the automobile starting process until the first peak power is smaller than the second peak power, and executes the subsequent step of adjusting the upper limit of the motor torque. The first peak power is the peak power available to the vehicle, and the second peak power is the peak power required by the vehicle, that is, the power required when the torque of the motor reaches the maximum value (the external characteristic of the motor).
In order to monitor the first peak power, the vehicle starting control device may monitor the peak power of the battery and the peak power of the range extender, and then use the sum of the peak power of the battery and the peak power of the range extender as the first peak power.
In order to monitor the second peak power, the vehicle starting control device may first obtain an external characteristic curve of the vehicle in a normal temperature environment, monitor the motor speed at the current moment, determine the peak power of the vehicle at the motor speed according to the external characteristic curve, and use the peak power as the second peak power.
203: and comparing the first peak power and the second peak power.
In the embodiment of the present application, in the process of monitoring the first peak power and the second peak power, the vehicle start control device compares the magnitudes of the first peak power and the second peak power every time the first peak power and the second peak power are detected, and if the first peak power is greater than or equal to the second peak power, continues to detect the first peak power and the second peak power until the first peak power is detected to be smaller than the second peak power, and then executes the next step, for example, step 204.
204: and when the first peak power is smaller than the second peak power, setting a torque upper limit of the motor according to the first peak power, and limiting the torque of the motor according to the torque upper limit of the motor.
In the embodiment of the present invention, when the first peak power is smaller than the second peak power, the vehicle start control device sets the motor torque upper limit based on the first peak power, and limits the torque of the motor based on the motor torque upper limit, that is, controls the torque of the vehicle not to exceed the motor torque upper limit. Otherwise, in the case that the first peak power is greater than or equal to the second peak power, the upper torque limit of the motor is continuously maintained at the safe torque, and the step 202 is continuously executed until the first peak power is detected to be smaller than the second peak power. The method for setting the upper limit of the motor torque according to the first peak power comprises two modes: in the first mode, the upper limit of the motor torque is adjusted in real time; in the second mode, the upper limit of the motor torque is adjusted by looking up a table. For specific implementation of the two modes, reference may be made to the foregoing contents, and details are not described herein again.
In one possible embodiment, in the case that the temperature of the battery is lower than the preset temperature, the battery is heated until the first peak power is greater than or equal to the second peak power, and a preset default torque is set as the upper limit of the torque of the motor, wherein the default torque comprises a peak torque in an external characteristic curve in a normal temperature environment.
In summary, in the embodiment of the present application, before the vehicle starts, the battery temperature is detected to pre-determine whether there may be a situation that the available peak power is insufficient in the starting process of the vehicle, and if the situation is insufficient, the preset safe torque is used as the upper limit of the motor torque, which makes: after the automobile starts, if the first peak power is smaller than the second peak power, the automobile starting control device cannot shake the automobile when the upper limit of the motor torque of the automobile is adjusted from a smaller safe torque to a larger upper limit of the motor torque, and therefore the technical effect of shake prevention is further enhanced.
Referring to fig. 3, the embodiment of the invention also provides an automobile starting control device. The embodiments of the present invention may perform division of functional units on a device according to the above method examples, for example, each functional unit may be divided corresponding to each function, or two or more functions may be integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit. It should be noted that the division of the unit in the embodiment of the present invention is schematic, and is only a logic function division, and there may be another division manner in actual implementation. As shown in fig. 3, the vehicle start control device includes a detection unit 310, a comparison unit 320, and a control unit 330, specifically:
the detection unit 310 is configured to monitor a first peak power and a second peak power in a starting process of the automobile, where the first peak power is a peak power available to the automobile, and the second peak power is a peak power required by the automobile; a comparing unit 320 for comparing the magnitudes of the first peak power and the second peak power; and the control unit 330 is configured to set an upper torque limit of the motor according to the first peak power and limit the torque of the motor according to the upper torque limit of the motor when the first peak power is smaller than the second peak power.
Optionally, the control unit 330 is specifically configured to: monitoring the rotating speed of the motor at the current moment; and obtaining the peak torque at the rotating speed of the motor according to the first peak power, and taking the peak torque as the upper torque limit of the motor.
Optionally, the control unit 330 is specifically configured to: acquiring a torque gradient table corresponding to the first peak power, wherein the torque gradient table is used for indicating at least one peak torque which is reduced in gradient along with the increase of the rotating speed of the motor; and setting the upper limit of the motor torque according to the peak torque from large to small in the torque gradient table.
Optionally, the detecting unit 310 is further configured to detect a battery temperature; and the control unit is further used for acquiring a preset safe torque as an upper limit of the motor torque under the condition that the battery temperature is lower than the preset temperature, setting the upper limit of the motor torque according to the first peak power and limiting the torque of the motor according to the upper limit of the motor torque under the condition that the first peak power is monitored to be lower than the second peak power.
Optionally, the detecting unit 310 is further configured to monitor a battery temperature; the automobile starting control device further comprises a heating unit 340, wherein the heating unit 340 is used for heating the battery under the condition that the temperature of the battery is lower than the preset temperature until the first peak power is larger than or equal to the second peak power.
Optionally, the detection unit 310 is specifically configured to monitor a peak power of the battery and a peak power of the range extender; the sum of the peak power of the battery and the peak power of the range extender is taken as the first peak power.
Optionally, the detection unit 310 is specifically configured to obtain an external characteristic curve of the automobile in a normal temperature environment, and monitor a motor speed at the current time; and determining the peak power of the automobile at the motor speed according to the external characteristic curve, and taking the peak power as a second peak power.
According to the embodiment of the application, the detection unit 310 is used for monitoring the available peak power and the required peak power in the automobile starting process in real time, the comparison unit 320 is used for comparing the values of the first peak power and the second peak power, the control unit 330 is used for setting the upper limit of the motor torque according to the first peak power, and the torque of the motor is limited according to the upper limit of the motor torque. Therefore, the motor torque upper limit of the automobile can be dynamically and smoothly changed, the phenomenon that the high torque is reduced to the low torque at once when the automobile starts from a large throttle due to over-discharge protection of the battery is prevented, and the shaking of the automobile is reduced.
Referring to fig. 4, a schematic block diagram of a vehicle start control device according to another embodiment of the present application is provided. The vehicle start control apparatus in the present embodiment as shown in the drawings may include: a processor 410 and a memory 420. The processor 410 and the memory 420 are connected by a bus 430.
The processor 410 may be a Central Processing Unit (CPU), a general purpose processor, a coprocessor, a Digital Signal Processor (DSP), an application-specific integrated circuit (ASIC), a Field Programmable Gate Array (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The processor 410 may also be a combination of computing functions, e.g., comprising one or more microprocessors in combination, a DSP and a microprocessor in combination, or the like. In this embodiment, the processor 410 may be a single chip, and various control functions may be implemented by programming the single chip, for example, in this embodiment, the functions of collecting, processing, and demodulating the battery data signal and the level signal are implemented, and the processor has the advantages of powerful computing capability and fast processing. Wherein the processor 410 calls the program code stored in the memory 420 to perform the above-described method.
Specifically, the processor 410 is configured to execute the function of the detection unit 310, and is configured to monitor a first peak power and a second peak power in a starting process of the vehicle, where the first peak power is a peak power available to the vehicle, and the second peak power is a peak power required by the vehicle; and is further configured to perform the function of the comparing unit 320, for comparing the magnitudes of the first peak power and the second peak power; and also for performing the function of the control unit 330 for setting an upper motor torque limit according to the first peak power and limiting the torque of the motor according to the upper motor torque limit, in case the first peak power is smaller than the second peak power.
Optionally, the processor 410 is specifically configured to: monitoring the rotating speed of the motor at the current moment; and obtaining the peak torque at the rotating speed of the motor according to the first peak power, and taking the peak torque as the upper torque limit of the motor.
Optionally, the processor 410 is specifically configured to: acquiring a torque gradient table corresponding to the first peak power, wherein the torque gradient table is used for indicating at least one peak torque which is reduced in gradient along with the increase of the rotating speed of the motor; and setting the upper limit of the motor torque according to the peak torque from large to small in the torque gradient table.
Optionally, the processor 410 is further configured to detect a battery temperature; and the control circuit is also used for acquiring a preset safe torque as the upper limit of the motor torque under the condition that the battery temperature is lower than the preset temperature, setting the upper limit of the motor torque according to the first peak power and limiting the motor torque according to the upper limit of the motor torque under the condition that the first peak power is monitored to be lower than the second peak power.
Optionally, the processor 410 is further configured to monitor a battery temperature; the processor 410 is further configured to perform a function of the heating unit 340, which is configured to heat the battery until the first peak power is greater than or equal to the second peak power if the battery temperature is less than the preset temperature.
Optionally, the processor 410 is specifically configured to monitor a peak power of the battery and a peak power of the range extender; the sum of the peak power of the battery and the peak power of the range extender is taken as the first peak power.
Optionally, the processor 410 is specifically configured to obtain an external characteristic curve of the automobile in a normal temperature environment, and monitor a motor speed at the current time; and determining the peak power of the automobile at the motor speed according to the external characteristic curve, and taking the peak power as a second peak power.
The present application further provides a computer-readable storage medium having stored thereon a plurality of instructions adapted to be loaded by a processor and to perform the method of any of the preceding embodiments.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An automobile starting control method is characterized by comprising the following steps:
monitoring a first peak power and a second peak power in the starting process of an automobile, wherein the first peak power is the peak power available to the automobile, and the second peak power is the peak power required by the automobile;
comparing the magnitude of the first peak power and the magnitude of the second peak power;
and under the condition that the first peak power is smaller than the second peak power, setting a motor torque upper limit according to the first peak power, and limiting the torque of the motor according to the motor torque upper limit.
2. The method of claim 1, wherein said step of setting an upper motor torque limit based on said first peak power comprises:
monitoring the rotating speed of the motor at the current moment;
and obtaining peak torque under the motor rotating speed according to the first peak power, and taking the peak torque as the upper limit of the motor torque.
3. The method of claim 1, wherein said step of setting an upper motor torque limit based on said first peak power comprises:
acquiring a torque gradient table corresponding to the first peak power, wherein the torque gradient table is used for indicating at least one peak torque which is decreased in gradient along with the increase of the rotating speed of the motor;
and setting the upper limit of the motor torque according to the peak torque from large to small in the torque gradient table.
4. The method of claim 1, further comprising:
before the automobile starts, detecting the temperature of a battery, and acquiring a preset safe torque as the upper limit of the torque of the motor under the condition that the temperature of the battery is lower than a preset temperature;
and under the condition that the first peak power is monitored to be smaller than the second peak power, executing the steps of setting a motor torque upper limit according to the first peak power and limiting the torque of the automobile according to the motor torque upper limit.
5. The method of claim 1, wherein in the case that the first peak power is smaller than the second peak power, further comprising:
monitoring the temperature of the battery;
and heating the battery under the condition that the temperature of the battery is less than the preset temperature until the first peak power is greater than or equal to the second peak power.
6. The method of claim 1, wherein the step of monitoring a first peak power of the vehicle comprises:
monitoring the peak power of the battery and the peak power of the range extender;
and taking the sum of the peak power of the battery and the peak power of the range extender as a first peak power.
7. The method of claim 1, wherein the step of monitoring the second peak power of the vehicle comprises:
acquiring an external characteristic curve of the automobile in a normal temperature environment, and monitoring the motor rotating speed at the current moment;
and determining the peak power of the automobile at the motor speed according to the outer characteristic curve, and taking the peak power as the second peak power.
8. An automobile starting control device, characterized by comprising:
the device comprises a detection unit, a power control unit and a power control unit, wherein the detection unit is used for monitoring a first peak power and a second peak power in the starting process of an automobile, the first peak power is the available peak power of the automobile, and the second peak power is the peak power required by the automobile;
the comparison unit is used for comparing the magnitude of the first peak power and the magnitude of the second peak power;
and the control unit is used for setting a motor torque upper limit according to the first peak power and limiting the torque of the automobile according to the motor torque upper limit under the condition that the first peak power is smaller than the second peak power.
9. The automobile starting control device is characterized by comprising a processor and a memory, wherein the processor and the memory are connected through a bus; the processor to execute a plurality of instructions; the storage medium is used for storing the instructions, and the instructions are suitable for being loaded by the processor and executing the automobile starting control method according to any one of claims 1-7.
10. A computer-readable storage medium having stored thereon a plurality of instructions adapted to be loaded by a processor and to perform a method of controlling a vehicle launch according to any of claims 1-7.
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