CN114148177B - Automatic adjustment method and device for charging cut-off point - Google Patents
Automatic adjustment method and device for charging cut-off point Download PDFInfo
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- CN114148177B CN114148177B CN202010923546.XA CN202010923546A CN114148177B CN 114148177 B CN114148177 B CN 114148177B CN 202010923546 A CN202010923546 A CN 202010923546A CN 114148177 B CN114148177 B CN 114148177B
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000011084 recovery Methods 0.000 claims abstract description 59
- 238000001514 detection method Methods 0.000 claims description 24
- 238000012360 testing method Methods 0.000 claims description 18
- 238000004364 calculation method Methods 0.000 claims description 9
- 230000003247 decreasing effect Effects 0.000 claims description 8
- 239000003550 marker Substances 0.000 claims description 8
- 238000012937 correction Methods 0.000 claims description 7
- 238000004088 simulation Methods 0.000 claims description 7
- 206010039203 Road traffic accident Diseases 0.000 description 4
- 238000004378 air conditioning Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 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
- B60L7/00—Electrodynamic brake systems for vehicles in general
- B60L7/24—Electrodynamic brake systems for vehicles in general with additional mechanical or electromagnetic braking
- B60L7/26—Controlling the braking effect
-
- 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
- B60L7/00—Electrodynamic brake systems for vehicles in general
- B60L7/10—Dynamic electric regenerative braking
- B60L7/18—Controlling the braking effect
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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
- B60L2260/00—Operating Modes
- B60L2260/40—Control modes
- B60L2260/50—Control modes by future state prediction
- B60L2260/54—Energy consumption estimation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a method and a device for automatically adjusting a charging cut-off point, wherein the automatic adjustment method comprises the following steps: when the electric vehicle meets a preset charging condition, calculating the running distance from a first mark point to a second mark point of the electric vehicle and the electric vehicle load consumption electric energy; calculating recoverable electric energy of the electric vehicle from the second mark point to the first mark point according to the driving distance, the electric vehicle load consumption electric energy and the actual energy recovery rate of the electric vehicle, and taking the ratio of the recoverable electric energy to the total capacity of the electric vehicle high-voltage battery as an electric quantity change value; and adjusting the charging cut-off point of the electric vehicle from the minimum value to the maximum value of the charging cut-off point according to the electric quantity change value. According to the embodiment of the invention, the electric vehicle can realize vehicle braking by using the energy recovery function in the whole course while ensuring the electric quantity of the high-voltage battery in the running process of the electric vehicle, and the running safety of the vehicle is effectively improved.
Description
Technical Field
The invention relates to the technical field of electric vehicles, in particular to a method and a device for automatically adjusting a charging cut-off point.
Background
With the development of electric vehicle technology, the use of electric vehicles is more and more widely, and sales of electric vehicles are also increasing. In the existing electric vehicle technology, a strong energy recovery function gradually becomes standard of an electric vehicle, and the function can achieve the purpose that the vehicle is decelerated without stepping on a brake pedal, and the vehicle can still be braked by stepping on the brake pedal in an emergency. However, when the high-voltage battery is fully charged, the electric vehicle cannot realize vehicle braking by adopting a strong energy recovery function, so that the safety problem of thermal failure of a braking system is easily caused by frequent use of conventional braking, and the running safety of the vehicle is poor.
Disclosure of Invention
The invention provides a method and a device for automatically adjusting a charging cut-off point, which are used for solving the technical problems that the vehicle braking cannot be realized through strong energy recovery when the charging is finished in the prior art, and the safety problem of thermal failure of a braking system is easily caused by frequent use of conventional braking, so that the safety of the vehicle running is poor.
The first embodiment of the invention provides a method for automatically adjusting a charging cut-off point, which comprises the following steps:
when the electric vehicle meets a preset charging condition, calculating the running distance from a first mark point to a second mark point of the electric vehicle and the electric vehicle load consumption electric energy; wherein the altitude of the second marker point is higher than the altitude of the first marker point;
calculating recoverable electric energy of the electric vehicle from the second mark point to the first mark point according to the driving distance, the electric vehicle load consumption electric energy and the actual energy recovery rate of the electric vehicle, and taking the ratio of the recoverable electric energy to the total capacity of the electric vehicle high-voltage battery as an electric quantity change value;
and adjusting the charging cut-off point of the electric vehicle from the minimum value to the maximum value of the charging cut-off point according to the electric quantity change value.
In one embodiment of the present invention, before "calculating a travel distance of the electric vehicle from a first mark point to a second mark point and electric power consumption by an electric vehicle load", the method includes:
acquiring charging data of the electric vehicle, and judging that the electric vehicle meets preset charging conditions when the charging data meets the preset charging conditions of the electric vehicle.
In one embodiment of the present invention, the charging data includes, but is not limited to, an ESP system state, a motor recovery torque, a vehicle fault signal, and an atmospheric pressure detection value, and when the charging data meets a preset charging condition of an electric vehicle, it is determined that the electric vehicle meets the preset charging condition, specifically:
and judging that the electric vehicle meets a preset charging condition when detecting that the atmospheric pressure detection value is smaller than a standard atmospheric pressure value and the atmospheric pressure detection value is in a decreasing trend, the ESP system is in a normal state, the motor recovery torque is normal and no fault affecting the normal charging of the electric vehicle exists in the vehicle fault signal.
In one embodiment of the present invention, the calculating the travel distance of the electric vehicle from the first mark point to the second mark point and the electric vehicle load consumption electric energy specifically includes:
acquiring a first mark point and a second mark point of the electric vehicle according to the change of the atmospheric pressure detection value of the electric vehicle;
and calculating the driving distance of the electric vehicle from the first mark point to the second mark point and the electric vehicle load consumption electric energy.
In one embodiment of the invention, the energy recovery rate of the electric vehicle is obtained by performing simulation test of mountain road working conditions and real vehicle test of actual roads on the electric vehicle; and setting a temperature correction coefficient to correct the energy recovery rate, so as to obtain the actual energy recovery rate of the electric vehicle.
In one embodiment of the present invention, the calculating the recoverable electric energy of the electric vehicle from the second mark point to the first mark point according to the driving distance, the electric vehicle load consumption electric energy and the actual energy recovery rate of the electric vehicle specifically includes:
and calculating to obtain total electric power consumption of the electric vehicle according to the driving distance and the actual energy recovery rate of the electric vehicle, and taking the difference value between the total electric power consumption of the electric vehicle and the electric power consumption of the electric vehicle load as recoverable electric power of the electric vehicle from the second mark point to the first mark point.
In one embodiment of the present invention, the charging cut-off point of the electric vehicle is adjusted from the minimum value to the maximum value of the charging cut-off point according to the electric quantity change value, specifically:
in one embodiment of the present invention, the electric vehicle load consumes electric power including, but not limited to, air conditioning.
A second embodiment of the present invention provides an automatic adjustment device for a charging cut-off point, including:
the first calculation module is used for calculating the running distance from the first mark point to the second mark point of the electric vehicle and the electric vehicle load consumption electric energy when the electric vehicle meets the preset charging condition; wherein the altitude of the second marker point is higher than the altitude of the first marker point;
the second calculation module is used for calculating recoverable electric energy of the electric vehicle from the second mark point to the first mark point according to the driving distance, the electric vehicle load consumption electric energy and the actual energy recovery rate of the electric vehicle, and taking the ratio of the recoverable electric energy to the total capacity of the electric vehicle high-voltage battery as an electric quantity change value;
and the adjusting module is used for adjusting the charging cut-off point of the electric vehicle from the minimum value to the maximum value of the charging cut-off point according to the electric quantity change value.
In one embodiment of the present invention, the automatic adjustment device further includes a determining module, where the determining module is configured to obtain charging data of the electric vehicle, and determine that the electric vehicle meets a preset charging condition when the charging data meets the preset charging condition of the electric vehicle.
In one embodiment of the present invention, the charging data includes, but is not limited to, ESP system status, motor recovery torque, vehicle fault signal, and barometric pressure detection value, and the determination module is specifically configured to:
and judging that the electric vehicle meets a preset charging condition when detecting that the atmospheric pressure detection value is smaller than a standard atmospheric pressure value and the atmospheric pressure detection value is in a decreasing trend, the ESP system is in a normal state, the motor recovery torque is normal and no fault affecting the normal charging of the electric vehicle exists in the vehicle fault signal.
The invention provides a method and a device for automatically adjusting a charging cut-off point, which can ensure the electric quantity of a higher-voltage battery and realize vehicle braking by using an energy recovery function in the whole course in the running process of an electric vehicle without frequent conventional braking, thereby effectively improving the running safety of the vehicle.
Drawings
Fig. 1 is a schematic flow chart of a method for automatically adjusting a charging cut-off point according to an embodiment of the present invention;
fig. 2 is another flow chart of a method for automatically adjusting a charging cut-off point according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an automatic adjustment device for a charging cut-off point according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In the description of the present application, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or an implicit indication of the number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
Referring to fig. 1, a first embodiment of the present invention provides a method for automatically adjusting a charging cutoff point, including:
s1, when the electric vehicle meets a preset charging condition, calculating a driving distance S from a first mark point t1 to a second mark point t2 of the electric vehicle and electric vehicle load consumption electric energy W AC The method comprises the steps of carrying out a first treatment on the surface of the Wherein the altitude of the second mark point is higher than the altitude of the first mark point;
in one embodiment of the invention, the electric vehicle load consumes power including, but not limited to, air conditioning.
S2, calculating recoverable electric energy of the electric vehicle from the second mark point to the first mark point according to the driving distance, the electric power consumption of the load of the electric vehicle and the actual energy recovery rate of the electric vehicle, and taking the ratio of the recoverable electric energy to the total capacity of the high-voltage battery of the electric vehicle as an electric quantity change value;
specifically, the total electric power consumption Δw of the electric vehicle is calculated according to the driving distance and the actual energy recovery rate of the electric vehicle, the difference value between the total electric power consumption of the electric vehicle and the electric power consumption of the electric vehicle load is used as recoverable electric power, and the duty ratio of the recoverable electric power and the total capacity of the high-voltage battery of the electric vehicle is used as an electric quantity change value Δsoc.
And S3, adjusting the charging cut-off point of the electric vehicle from the minimum value to the maximum value of the charging cut-off point according to the electric quantity change value.
Fig. 2 is a schematic flow chart of a method for automatically adjusting a charging cut-off point according to an embodiment of the invention. As a specific implementation mode, an original charging cut-off point of a high-voltage battery of an electric vehicle is set to be a value 1, after the electric vehicle reaches a second mark point and stops running, the VCU controller is utilized to adjust the charging cut-off point of the electric vehicle to be a difference value between the original cut-off point and an electric quantity change value, and the high-voltage battery of the electric vehicle is charged according to the charging cut-off point control, so that the electric quantity of the high-voltage battery of the electric vehicle when the electric vehicle runs from the second mark point to the first mark point is higher, and meanwhile, the high-voltage battery of the electric vehicle can be provided with a strong energy recovery function in the whole process of running so as to realize vehicle braking, and the risk of traffic accidents caused by overheat failure of a brake caliper or a friction plate due to frequent use of conventional braking is avoided, so that the running safety of the vehicle is effectively improved.
In one embodiment of the present invention, before "calculating a travel distance of an electric vehicle from a first mark point to a second mark point and electric power consumption by an electric vehicle load", it includes:
acquiring charging data of the electric vehicle, and judging that the electric vehicle meets preset charging conditions when the charging data meets the preset charging conditions of the electric vehicle.
In one embodiment of the present invention, the charging data includes, but is not limited to, ESP system status, motor recovery torque, vehicle fault signal and barometric pressure detection value, and when the charging data meets a preset charging condition of the electric vehicle, it is determined that the electric vehicle meets the preset charging condition, specifically: and when the detected atmospheric pressure detection value is smaller than the standard atmospheric pressure value and the detected atmospheric pressure value is in a decreasing trend, the ESP system is in a normal state, the motor recovery torque is normal, and no fault affecting the normal charging of the electric vehicle exists in the vehicle fault signals, judging that the electric vehicle meets the preset charging condition. In the running process of the electric vehicle, the whole vehicle controller VCU is utilized to detect and judge charging data, and meanwhile, if the plurality of conditions are met, the electric vehicle is judged to meet the preset charging conditions, so that the electric vehicle enters a mountain charging mode. When the atmospheric pressure detection value is smaller than the standard atmospheric pressure value and the atmospheric pressure detection value is in a decreasing trend, the electric vehicle is driven at a low-altitude place to a high-altitude place. According to the embodiment of the invention, by judging the charging data of various types and judging that the electric vehicle meets the preset charging condition when all the charging data meet the preset condition at the same time, the judgment on whether the electric vehicle meets the preset charging condition is more comprehensive and accurate, and the reliability and accuracy of adjusting the charging cut-off point are improved.
In one embodiment of the invention, the running distance of the electric vehicle from the first mark point to the second mark point and the electric vehicle load consumption electric energy are calculated, specifically:
acquiring a first mark point and a second mark point of the electric vehicle according to the change of the atmospheric pressure detection value of the electric vehicle;
and calculating the driving distance of the electric vehicle from the first mark point to the second mark point and the electric vehicle load consumption electric energy.
In one embodiment of the invention, the energy recovery rate of the electric vehicle is obtained by performing simulation test of mountain road working conditions and real vehicle test of actual roads on the electric vehicle; and setting a temperature correction coefficient to correct the energy recovery rate, so as to obtain the actual energy recovery rate of the electric vehicle.
In the embodiment of the invention, because the energy recovery is related to the temperature of each component, when the electric vehicle is subjected to simulation test of mountain road working conditions and real vehicle test of actual roads, test environments with different temperatures are set, and the temperature correction parameter beta is set to correct the energy recovery, so that the actual energy recovery alpha of the electric vehicle is obtained, the accuracy of the calculation of recoverable electric energy is improved, and the accuracy of the charging cut-off point of the electric vehicle is improved.
In one embodiment of the invention, according to the driving distance, the electric power consumed by the load of the electric vehicle and the actual energy recovery rate of the electric vehicle, the recoverable electric power of the electric vehicle from the second mark point to the first mark point is calculated, specifically:
and calculating to obtain the total electric power consumption of the electric vehicle according to the driving distance and the actual energy recovery rate of the electric vehicle, and taking the difference value between the total electric power consumption of the electric vehicle and the electric power consumption of the electric vehicle load as the recoverable electric power of the electric vehicle from the second mark point to the first mark point.
The embodiment of the invention has the following beneficial effects:
according to the embodiment of the invention, the altitude change, the driving distance and the electric vehicle load consumption energy of the electric vehicle from the first mark point to the second mark point are comprehensively considered, the influence of the electric vehicle load consumption energy on the recoverable electric energy is comprehensively considered, the charging cut-off point of the electric vehicle is adjusted, and the high-voltage battery of the electric vehicle is charged according to the charging cut-off point, so that the electric quantity of the high-voltage battery is higher when the electric vehicle is driven from the second mark point to the first mark point, and meanwhile, the high-voltage battery has a strong energy recovery function in the whole process of driving the electric vehicle so as to realize vehicle braking, and the risk of traffic accidents caused by overheat failure of a brake caliper or a friction plate due to frequent use of conventional braking is avoided, thereby effectively improving the driving safety of the vehicle; and moreover, the working time of the braking system is reduced in the process of traveling from a high-altitude place to a low-altitude place, the service life of the braking system can be effectively prolonged, and meanwhile, the brake sound and the coke smell of the friction plate during long downhill are reduced, so that the driving experience and the riding comfort are improved.
Referring to fig. 3, a second embodiment of the present invention provides an automatic adjustment device for a charging cut-off point, including:
the first calculation module 10 is used for calculating the running distance from the first mark point to the second mark point of the electric vehicle and the electric power consumption of the load of the electric vehicle when the electric vehicle meets the preset charging condition; wherein the altitude of the second mark point is higher than the altitude of the first mark point;
in one embodiment of the invention, the electric vehicle load consumes power including, but not limited to, air conditioning.
The second calculation module 20 is configured to calculate recoverable electric energy of the electric vehicle from the second mark point to the first mark point according to the driving distance, the electric power consumed by the load of the electric vehicle, and the actual energy recovery rate of the electric vehicle, and take a duty ratio of the recoverable electric energy and the total capacity of the high-voltage battery of the electric vehicle as an electric quantity change value;
specifically, the total electric power consumption Δw of the electric vehicle is calculated according to the driving distance and the actual energy recovery rate of the electric vehicle, the difference value between the total electric power consumption of the electric vehicle and the electric power consumption of the electric vehicle load is used as recoverable electric power, and the duty ratio of the recoverable electric power and the total capacity of the high-voltage battery of the electric vehicle is used as an electric quantity change value Δsoc.
The adjustment module 30 is configured to adjust a charging cutoff point of the electric vehicle from a minimum value to a maximum value of the charging cutoff point according to the electric quantity change value.
As a specific implementation mode, an original charging cut-off point of a high-voltage battery of an electric vehicle is set to be a value 1, after the electric vehicle reaches a second mark point and stops running, the VCU controller is utilized to adjust the charging cut-off point of the electric vehicle to be a difference value between the original cut-off point and an electric quantity change value, and the high-voltage battery of the electric vehicle is charged according to the charging cut-off point control, so that the electric quantity of the high-voltage battery of the electric vehicle when the electric vehicle runs from the second mark point to the first mark point is higher, and meanwhile, the high-voltage battery of the electric vehicle can be provided with a strong energy recovery function in the whole process of running so as to realize vehicle braking, and the risk of traffic accidents caused by overheat failure of a brake caliper or a friction plate due to frequent use of conventional braking is avoided, so that the running safety of the vehicle is effectively improved.
In one embodiment of the present invention, the automatic adjustment device further includes a determining module, where the determining module is configured to obtain charging data of the electric vehicle, and determine that the electric vehicle meets a preset charging condition when the charging data meets the preset charging condition of the electric vehicle.
In one embodiment of the present invention, the charging data includes, but is not limited to, ESP system status, motor recovery torque, vehicle fault signal and barometric pressure detection value, and when the charging data meets a preset charging condition of the electric vehicle, it is determined that the electric vehicle meets the preset charging condition, specifically: and when the detected atmospheric pressure detection value is smaller than the standard atmospheric pressure value and the detected atmospheric pressure value is in a decreasing trend, the ESP system is in a normal state, the motor recovery torque is normal, and no fault affecting the normal charging of the electric vehicle exists in the vehicle fault signals, judging that the electric vehicle meets the preset charging condition. In the running process of the electric vehicle, the whole vehicle controller VCU is utilized to detect and judge charging data, and meanwhile, if the plurality of conditions are met, the electric vehicle is judged to meet the preset charging conditions, so that the electric vehicle enters a mountain charging mode. When the atmospheric pressure detection value is smaller than the standard atmospheric pressure value and the atmospheric pressure detection value is in a decreasing trend, the electric vehicle is driven at a low-altitude place to a high-altitude place. According to the embodiment of the invention, by judging the charging data of various types and judging that the electric vehicle meets the preset charging condition when all the charging data meet the preset condition at the same time, the judgment on whether the electric vehicle meets the preset charging condition is more comprehensive and accurate, and the reliability and accuracy of adjusting the charging cut-off point are improved.
In one embodiment of the present invention, the first computing module 10 is specifically configured to:
acquiring a first mark point and a second mark point of the electric vehicle according to the change of the atmospheric pressure detection value of the electric vehicle;
and calculating the driving distance of the electric vehicle from the first mark point to the second mark point and the electric vehicle load consumption electric energy.
In one embodiment of the invention, the energy recovery rate of the electric vehicle is obtained by performing simulation test of mountain road working conditions and real vehicle test of actual roads on the electric vehicle; and setting a temperature correction coefficient to correct the energy recovery rate, so as to obtain the actual energy recovery rate of the electric vehicle.
In the embodiment of the invention, because the energy recovery is related to the temperature of each component, when the electric vehicle is subjected to simulation test of mountain road working conditions and real vehicle test of actual roads, test environments with different temperatures are set, and the temperature correction parameter beta is set to correct the energy recovery, so that the actual energy recovery alpha of the electric vehicle is obtained, the accuracy of the calculation of recoverable electric energy is improved, and the accuracy of the charging cut-off point of the electric vehicle is improved.
In one embodiment of the present invention, the second computing module 20 is specifically configured to:
and calculating to obtain the total electric power consumption of the electric vehicle according to the driving distance and the actual energy recovery rate of the electric vehicle, and taking the difference value between the total electric power consumption of the electric vehicle and the electric power consumption of the electric vehicle load as the recoverable electric power of the electric vehicle from the second mark point to the first mark point.
The embodiment of the invention has the following beneficial effects:
according to the embodiment of the invention, the altitude change, the driving distance and the electric vehicle load consumption energy of the electric vehicle from the first mark point to the second mark point are comprehensively considered, the influence of the electric vehicle load consumption energy on the recoverable electric energy is comprehensively considered, the charging cut-off point of the electric vehicle is adjusted, and the high-voltage battery of the electric vehicle is charged according to the charging cut-off point, so that the electric quantity of the high-voltage battery is higher when the electric vehicle is driven from the second mark point to the first mark point, and meanwhile, the high-voltage battery has a strong energy recovery function in the whole process of driving the electric vehicle so as to realize vehicle braking, and the risk of traffic accidents caused by overheat failure of a brake caliper or a friction plate due to frequent use of conventional braking is avoided, thereby effectively improving the driving safety of the vehicle; and moreover, the working time of the braking system is reduced in the process of traveling from a high-altitude place to a low-altitude place, the service life of the braking system can be effectively prolonged, and meanwhile, the brake sound and the coke smell of the friction plate during long downhill are reduced, so that the driving experience and the riding comfort are improved.
The foregoing is a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention and are intended to be comprehended within the scope of the present invention.
Claims (8)
1. An automatic adjustment method for a charging cut-off point is characterized by comprising the following steps:
when the electric vehicle meets a preset charging condition, calculating the running distance from a first mark point to a second mark point of the electric vehicle and the electric vehicle load consumption electric energy; wherein the altitude of the second marker point is higher than the altitude of the first marker point;
calculating recoverable electric energy of the electric vehicle from the second mark point to the first mark point according to the driving distance, the electric vehicle load consumption electric energy and the actual energy recovery rate of the electric vehicle, and taking the ratio of the recoverable electric energy to the total capacity of a high-voltage battery of the electric vehicle as an electric quantity change value;
adjusting a charging cut-off point of the electric vehicle from a minimum value to a maximum value of the charging cut-off point according to the electric quantity change value;
according to the driving distance, the electric vehicle load consumption electric energy and the actual energy recovery rate of the electric vehicle, the recoverable electric energy of the electric vehicle from the second mark point to the first mark point is calculated, specifically:
calculating to obtain total electric power consumption of the electric vehicle according to the driving distance and the actual energy recovery rate of the electric vehicle, and taking the difference value between the total electric power consumption of the electric vehicle and the electric power consumption of the electric vehicle load as recoverable electric power of the electric vehicle from the second mark point to the first mark point;
the method comprises the steps of setting test environments with different temperatures, performing simulation test of mountain road working conditions and real vehicle test of actual roads on the electric vehicle, and obtaining energy recovery rate of the electric vehicle; and setting a temperature correction coefficient to correct the energy recovery rate, so as to obtain the actual energy recovery rate of the electric vehicle.
2. The automatic charge cutoff point adjustment method according to claim 1, comprising, before "calculating a travel distance of the electric vehicle from a first mark point to a second mark point and electric power consumption by an electric vehicle load:
acquiring charging data of the electric vehicle, and judging that the electric vehicle meets preset charging conditions when the charging data meets the preset charging conditions of the electric vehicle.
3. The method for automatically adjusting a charging cut-off point according to claim 2, wherein the charging data includes, but is not limited to, an ESP system state, a motor recovery torque, a vehicle fault signal, and an atmospheric pressure detection value, and when the charging data satisfies a preset charging condition of an electric vehicle, it is determined that the electric vehicle satisfies the preset charging condition, specifically:
and judging that the electric vehicle meets a preset charging condition when detecting that the atmospheric pressure detection value is smaller than a standard atmospheric pressure value and the atmospheric pressure detection value is in a decreasing trend, the ESP system is in a normal state, the motor recovery torque is normal and no fault affecting the normal charging of the electric vehicle exists in the vehicle fault signal.
4. The automatic adjustment method of the charging cut-off point according to claim 1, wherein the calculation of the travel distance of the electric vehicle from the first mark point to the second mark point and the electric vehicle load consumption electric energy specifically includes:
acquiring a first mark point and a second mark point of the electric vehicle according to the change of the atmospheric pressure detection value of the electric vehicle;
and calculating the driving distance of the electric vehicle from the first mark point to the second mark point and the electric vehicle load consumption electric energy.
5. The method of automatic charge cutoff point adjustment according to claim 1, wherein the electric vehicle load power consumption includes, but is not limited to, air conditioner power consumption.
6. An automatic charge cut-off point adjusting device, characterized by comprising:
the first calculation module is used for calculating the running distance from the first mark point to the second mark point of the electric vehicle and the electric vehicle load consumption electric energy when the electric vehicle meets the preset charging condition; wherein the altitude of the second marker point is higher than the altitude of the first marker point;
the second calculation module is used for calculating recoverable electric energy of the electric vehicle from the second mark point to the first mark point according to the driving distance, the electric vehicle load consumption electric energy and the actual energy recovery rate of the electric vehicle, and taking the ratio of the recoverable electric energy to the total capacity of the high-voltage battery of the electric vehicle as an electric quantity change value;
the adjustment module is used for adjusting the charging cut-off point of the electric vehicle from the minimum value to the maximum value of the charging cut-off point according to the electric quantity change value;
the second computing module is specifically configured to:
calculating to obtain total electric power consumption of the electric vehicle according to the driving distance and the actual energy recovery rate of the electric vehicle, and taking the difference value between the total electric power consumption of the electric vehicle and the electric power consumption of the electric vehicle load as recoverable electric power of the electric vehicle from the second mark point to the first mark point;
the method comprises the steps of setting test environments with different temperatures, performing simulation test of mountain road working conditions and real vehicle test of actual roads on the electric vehicle, and obtaining energy recovery rate of the electric vehicle; and setting a temperature correction coefficient to correct the energy recovery rate, so as to obtain the actual energy recovery rate of the electric vehicle.
7. The automatic charge cutoff point adjustment device according to claim 6, further comprising a determination module configured to obtain charge data of the electric vehicle, and determine that the electric vehicle satisfies a preset charge condition when the charge data satisfies the preset charge condition of the electric vehicle.
8. The automatic charge cut-off point adjustment device according to claim 7, wherein the charge data includes, but is not limited to, ESP system status, motor recovery torque, vehicle fault signal, and barometric pressure detection value, and the determination module is specifically configured to:
and judging that the electric vehicle meets a preset charging condition when detecting that the atmospheric pressure detection value is smaller than a standard atmospheric pressure value and the atmospheric pressure detection value is in a decreasing trend, the ESP system is in a normal state, the motor recovery torque is normal and no fault affecting the normal charging of the electric vehicle exists in the vehicle fault signal.
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