CN112498091B - Pure electric vehicle control method, terminal, medium and vehicle based on NEDC working condition - Google Patents

Pure electric vehicle control method, terminal, medium and vehicle based on NEDC working condition Download PDF

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Publication number
CN112498091B
CN112498091B CN202011448682.4A CN202011448682A CN112498091B CN 112498091 B CN112498091 B CN 112498091B CN 202011448682 A CN202011448682 A CN 202011448682A CN 112498091 B CN112498091 B CN 112498091B
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temperature
vehicle
working condition
current
cooling water
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CN112498091A (en
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赖科学
胡裕
墙超
张海宝
唐清发
徐松
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Qingling Motors Group Co Ltd
Qingling Motors Co Ltd
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Qingling Motors Group Co Ltd
Qingling Motors Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K11/00—Arrangement in connection with cooling of propulsion units
    • B60K11/02—Arrangement in connection with cooling of propulsion units with liquid cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K11/00—Arrangement in connection with cooling of propulsion units
    • B60K11/06—Arrangement in connection with cooling of propulsion units with air cooling
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • H02K9/193—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil with provision for replenishing the cooling medium; with means for preventing leakage of the cooling medium
    • 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
    • Y02T10/64—Electric machine technologies in electromobility
    • 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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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention provides a pure electric vehicle control method, a terminal, a medium and a vehicle based on a NEDC working condition, wherein the current motor temperature is obtained, if the current motor temperature is within a temperature range, a water pump is controlled to work intermittently, and if the current motor temperature is higher than a first high-temperature threshold value, the water pump is in a working state, and an electronic fan is controlled to work, so that the technical problems that the energy consumption of the vehicle is reduced and the energy utilization rate is improved by controlling the pure electric vehicle based on the NEDC working condition, and the driving mileage of the vehicle is further prolonged by controlling power consumption equipment of the vehicle, particularly vehicle power consumption equipment are solved, the energy consumption waste of the vehicle is caused by preventing the power consumption equipment such as the water pump from being in the working state all the time, the energy utilization rate of the pure electric vehicle based on the NEDC working condition can be improved, and the driving mileage of the vehicle is further prolonged.

Description

Pure electric vehicle control method, terminal, medium and vehicle based on NEDC working condition
Technical Field
The invention relates to the field of new energy automobiles, in particular to a pure electric vehicle control method, a terminal, a medium and a vehicle based on a NEDC working condition.
Background
With the development of society, the demand of automobiles is getting larger and larger, and the electric automobiles are more and more widely applied to balance the contradiction between the needs of people and the environment, resources and the like. The electric vehicle usually uses a power battery as an energy source to drive the whole vehicle, so that how to increase the driving range of the electric vehicle is always a concern due to the limitation of the battery capacity of the power battery.
The New European Driving Cycle (NEDC) is a standard for testing the comprehensive mileage of a New energy automobile, and comprises two working conditions, namely an urban working condition, which is simulated firstly, and acceleration, speed maintenance, deceleration and stopping are performed during testing. And repeating the operation for four times, and testing the second working condition, namely suburb working condition, wherein the speed is obviously higher than that of urban working condition under the suburb working condition.
Promote pure electric vehicles's continuation of the journey mileage under the NEDC operating mode, the promotion to the continuation of the journey mileage that pure electric vehicles is has comparatively important meaning, consequently how to control through the pure electric vehicles based on the NEDC operating mode, especially pure electric vehicles's power consumptive equipment controls to reduce the energy consumption of vehicle, promote energy utilization, and then extension vehicle continuation of the journey mileage is the problem of waiting to solve urgently.
Disclosure of Invention
In view of the above disadvantages of the prior art, an object of the present invention is to provide a method, a terminal, a medium and a vehicle for controlling a pure electric vehicle based on a NEDC operating condition, which are used to solve the technical problem of controlling the pure electric vehicle based on the NEDC operating condition, especially controlling power consumption devices of the pure electric vehicle, so as to reduce energy consumption of the vehicle, improve energy utilization rate, and further prolong a cruising range of the vehicle.
The invention provides a pure electric vehicle control method based on an NEDC working condition, which comprises the following steps:
acquiring the current motor temperature;
if the current motor temperature is within the temperature range, controlling a water pump to work intermittently, and radiating heat of the motor through cooling water of the water pump;
and if the current motor temperature is higher than a first high-temperature threshold value, the water pump is in a working state, and the electronic fan is controlled to work and used for radiating the cooling water.
Optionally, at least one of the following is also included:
if the current motor temperature is lower than a low-temperature threshold value, controlling the electronic fan to stop working;
if the current motor temperature is higher than a second high-temperature threshold value, controlling the water pump to be in a continuous working state, and controlling the flow rate of the cooling water according to the current motor temperature;
and the control of the intermittent operation of the water pump for cooling the motor comprises the control of the intermittent operation of the water pump through a PWM control signal.
Optionally, the method further includes:
and obtaining the bus current of the low-voltage platform, and if the bus current of the low-voltage platform is smaller than a current threshold value, supplying power by using a standby power supply which is connected with the voltage conversion module in parallel.
Optionally, the method further includes:
and acquiring the voltage of the standby power supply, and controlling the voltage conversion module to charge the standby power supply if the voltage is smaller than a voltage threshold.
Optionally, the method further includes:
acquiring current working condition information of a vehicle;
if the current working condition information comprises urban working conditions, reducing the vehicle speed to zero through electric braking, and controlling the vehicle to recover energy;
and if the current working condition information comprises suburb working conditions and the opening of an accelerator pedal is zero, reducing the speed of the vehicle to zero through electric braking, and controlling the vehicle to recover energy.
Optionally, if the current working condition information includes urban working conditions, the vehicle speed is reduced to zero through electric braking, and controlling the vehicle to recover energy includes:
if the vehicle is in an automatic driving state, the current working condition information comprises urban working conditions, the vehicle speed threshold value of the sliding recovery electric brake of the throttle valve is adjusted to be zero, the vehicle speed is reduced to be zero through the electric brake, and the vehicle is controlled to recover energy.
Optionally, if the current working condition information includes a suburb working condition and the opening of the accelerator pedal is zero, reducing the vehicle speed to zero by electric braking, and controlling the vehicle to perform energy recovery includes:
if the vehicle is in an automatic driving state, the current working condition information comprises a suburb working condition, the opening of an accelerator pedal is zero, the vehicle is in a suburb cycle deceleration parking stage, a hydraulic curve under the opening of a brake pedal in the deceleration parking stage is marked as zero, the electric braking strength under the opening of the brake pedal is enhanced, the vehicle speed is reduced to zero through electric braking, and the vehicle is controlled to recover energy.
The present invention also provides a vehicle comprising:
the temperature acquisition module is used for acquiring the current motor temperature;
the water pump control module is used for controlling the water pump to work intermittently if the current motor temperature is within a temperature range, and radiating heat of the motor through cooling water of the water pump;
and the electronic fan control module is used for controlling the electronic fan to work if the current motor temperature is higher than a first high-temperature threshold value, and the electronic fan is used for dissipating heat of the cooling water.
The invention also provides a terminal, which comprises a processor, a memory and a communication bus;
the communication bus is used for connecting the processor and the memory;
the processor is used for executing the computer program stored in the memory to realize the pure electric vehicle control method based on the NEDC working condition according to any one of the embodiments.
The present invention also provides a computer-readable storage medium having stored thereon a computer program for causing a computer to execute a method for controlling a pure electric vehicle based on NEDC operating conditions according to any of the embodiments described above.
As mentioned above, the pure electric vehicle control method, the terminal, the medium and the vehicle based on the NEDC working condition have the following beneficial effects:
by acquiring the current motor temperature, if the current motor temperature is within the temperature range, the water pump is controlled to work intermittently, and if the current motor temperature is higher than a first high-temperature threshold value, the water pump is in a working state, and the electronic fan is controlled to work. Therefore, the situation that power consumption equipment such as a water pump is always in a working state to cause energy consumption waste of the vehicle can be avoided, the energy utilization rate of the pure electric vehicle based on the NEDC working condition can be improved, and the cruising mileage of the vehicle can be further prolonged.
Drawings
Fig. 1 is a schematic flowchart of a method for controlling a pure electric vehicle based on NEDC operating conditions according to an embodiment of the present invention;
fig. 2 is a schematic specific flowchart of a method for controlling a pure electric vehicle based on the NEDC operating condition according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a vehicle according to a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments 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.
Example one
Referring to fig. 1, an embodiment of the present invention provides a method for controlling a pure electric vehicle based on an NEDC operating condition, including:
s101: and acquiring the current motor temperature.
Optionally, the current motor temperature may be detected by a temperature sensor, or acquired by using a related technical means, which is not limited herein.
Optionally, the current motor temperature is also the motor body temperature.
S102: and if the current motor temperature is within the temperature range, controlling the water pump to work intermittently, and radiating the heat of the motor by using the cooling water of the water pump.
Alternatively, the temperature range may be a temperature range set by a person skilled in the art, and is not limited thereto. For example: 35-55 ℃ and the like. In the temperature range, the motor can keep normal work, and the running requirement of the vehicle can be ensured. At the moment, the temperature of the motor does not need to be controlled accurately, and the normal running of the vehicle can be ensured. In order to save the energy consumption of the vehicle, the water pump can be controlled to work intermittently, so that certain electric quantity can be saved, the endurance mileage of the vehicle can be further improved, and the resource utilization rate is improved.
In some embodiments, the optional working temperature range of the motor is obtained, and the working efficiency of the motor can be improved by improving the working temperature range of the motor, so that the energy utilization rate is improved, and the energy consumption is reduced.
In some embodiments, the water pump may be controlled to operate intermittently by a PWM control signal.
Optionally, the working state of the water pump is controlled by a PWM control technique, so that the working time of the water pump is halved, and energy consumption is reduced.
Alternatively, the water pump may be controlled to operate intermittently in other ways, and the operation idle time periods of the water pumps may be equal or different.
In some embodiments, if the current motor temperature is within the temperature range, the method further comprises:
and acquiring temperature change values of the water inlet temperature and the water outlet temperature of the motor, and determining the flow rate of cooling water driven by the water pump.
Optionally, flow rates corresponding to a plurality of temperature change value ranges may be preset, and the flow rate of the cooling water is determined by determining the temperature change value range to which the temperature change value belongs. Optionally, the larger the temperature change value is, the larger the flow rate is, and the smaller the temperature change value is, the smaller the flow rate is.
For example, the temperature change value is determined to be 2 ℃ according to the water inlet temperature and the water outlet temperature of the current motor, the cooling water flow of the water pump at the moment is 10L/min according to the flow rates corresponding to a plurality of preset temperature change value ranges, and the cooling water flow is controlled to be 10L/min.
For another example, the temperature change value is determined to be 3 ℃ according to the water inlet temperature and the water outlet temperature of the current motor, the cooling water flow of the water pump at the moment is 13L/min according to the flow rates corresponding to a plurality of preset temperature change value ranges, and then the cooling water flow rate is controlled to be 13L/min.
In some embodiments, if the current motor temperature is within the temperature range, the method further comprises:
and acquiring a plurality of temperature change values of the water inlet temperature and the water outlet temperature of the motor within preset time, and determining the flow rate of cooling water driven by the water pump.
For example, 5 temperature change values of the inlet water temperature and the outlet water temperature of the motor are obtained within ten minutes, wherein the temperature change values are 2 ℃, 2.8 ℃, 3.9 ℃, 5.1 ℃ and 6 ℃, and the change range of the temperature change value of the motor is large, so that the flow rate of the cooling water needs to be increased. For another example, 5 temperature change values of the inlet water temperature and the outlet water temperature of the motor are obtained within ten minutes, wherein the temperature change values are 2 ℃, 2.3 ℃, 2.2 ℃, 2.4 ℃ and 2.6 ℃, and the change range of the temperature change value of the motor is small, so that the flow rate of the cooling water can be maintained.
In some embodiments, if the current motor temperature is higher than the second high temperature threshold, the water pump is controlled to be in a continuous working state, and the flow rate of the cooling water is controlled according to the current motor temperature.
Optionally, the second high temperature threshold is higher than the highest temperature in the temperature range.
If current motor temperature is higher than second high temperature threshold, then motor temperature is too high, at this moment, needs carry out the stronger cooling of intensity to the motor, so the water pump need be in continuous operating condition.
Alternatively, controlling the flow rate of the cooling water according to the motor temperature includes, but is not limited to: if the current motor temperature is higher than the second high-temperature threshold and lower than the warning temperature, the flow rate of the cooling water is kept; and if the current motor temperature is higher than the warning temperature, increasing the flow rate of the cooling water. Wherein the warning temperature is greater than the second high temperature threshold. Wherein, the flow rate of the cooling water is kept, namely the flow rate of the cooling water is kept consistent with the flow rate of the cooling water when the water pump works last time.
S103: if the current motor temperature is higher than the first high-temperature threshold value, the water pump is in a working state, and the electronic fan is controlled to work.
Optionally, the electronic fan is used for dissipating heat from the cooling water of the water pump.
Alternatively, the first high temperature threshold may be a temperature within the temperature range, or may be a temperature higher than the highest temperature in the temperature range.
Optionally, if the current motor temperature is higher than the first high-temperature threshold, the motor temperature is relatively high at this time, and in order to make the cooling effect of the cooling water better, the cooling water is cooled by the electronic fan, and the electronic fan is controlled to work at this time.
In some embodiments, the electronic fan is controlled to stop operating if the current motor temperature is below the low temperature threshold.
In some embodiments, if the current motor temperature is lower than the low-temperature threshold, the motor can be cooled based on the cooling of the cooling water, so that the electronic fan is controlled to pause. Therefore, the energy consumption of the electronic fan can be saved, and the cruising ability of the vehicle is further improved.
Optionally, the first high temperature threshold and the low temperature threshold may be the same or the first high temperature threshold is higher than the low temperature threshold, that is, the low temperature threshold is not less than the first high temperature threshold.
Optionally, if the first high temperature threshold is higher than the low temperature threshold, the cooling effect on the motor can be ensured on the basis of reducing the working time of the electronic fan as much as possible.
That is, the electronic fan is not turned on in the whole course during the course of endurance, and the working mechanism thereof is controlled and adjusted by other signal states, such as the current temperature of the motor, the working state of the water pump, and the like.
For example, the motor temperature is above 45 ℃, the electronic fan is turned on; the temperature of the motor body is lower than 40 ℃, and the electronic fan is closed. The current is maintained at about 15A when the electronic fan is turned on. And in the fan closing stage, the temperature of the motor body is still below 40 ℃.
Optionally, if the current motor temperature is lower than the low-temperature threshold, the motor temperature does not need to be rapidly reduced in the current state, that is, the working time of the electronic fan can be further compressed, that is, the electronic fan is turned off early and turned on late, so that the electric energy loss of the electronic fan can be further reduced, resources are saved, and the endurance mileage is increased.
In some embodiments, the method further comprises:
and acquiring the bus current of the low-voltage platform, and if the bus current of the low-voltage platform is smaller than a current threshold value, supplying power by using a standby power supply.
Optionally, the backup power supply is connected in parallel with the voltage conversion module (i.e., the DCDC module).
Optionally, if the low-voltage platform bus current is smaller than the current threshold, the DCDC module is continuously used for supplying power, so that the energy utilization efficiency is low, and the energy consumption loss is large. The backup power supply connected with the DCDC module in parallel can be used for supplying power so as to reduce energy loss.
In some embodiments, the voltage of the backup power is obtained, and if the voltage is less than the voltage threshold, the voltage conversion module is controlled to charge the backup power.
With the use of the standby power supply, the electric energy storage of the standby power supply is less and less, and when the standby power supply is in power shortage, namely the voltage of the standby power supply is smaller than the voltage threshold, the standby power supply is charged through the DCDC module, so that the normal use of the subsequent standby power supply is ensured.
It should be noted that, if the current of the low-voltage platform bus is smaller than the current threshold and the voltage of the standby power supply is smaller than the voltage threshold, the DCDC module is used for supplying power and controlling the DCDC module to charge the standby power supply.
Optionally, the backup power supply comprises several 12V power supplies.
In some embodiments, applied to NEDC conditions, the method further comprises:
acquiring current working condition information of a vehicle;
if the current working condition information comprises urban working conditions, reducing the vehicle speed to zero through electric braking, and controlling the vehicle to recover energy;
and if the current working condition information comprises suburb working conditions and the opening of the accelerator pedal is zero, reducing the vehicle speed to zero through electric braking, and controlling the vehicle to recover energy.
Optionally, if the current working condition information includes urban working conditions, the vehicle speed is reduced to zero by electric braking, and controlling the vehicle to recover energy includes:
if the vehicle is in an automatic driving state, the current working condition information comprises urban working conditions, the vehicle speed threshold value of the sliding recovery electric brake of the throttle valve is adjusted to be zero, the vehicle speed is reduced to be zero through the electric brake, and the vehicle is controlled to recover energy.
Optionally, if the current working condition information includes a suburb working condition, and the accelerator pedal opening is zero, the vehicle speed is reduced to zero through the electric brake, and controlling the vehicle to perform energy recovery includes:
if the vehicle is in an automatic driving state, the current working condition information comprises a suburb working condition, the opening of an accelerator pedal is zero, the vehicle is in a suburb cycle deceleration parking stage, a hydraulic curve under the opening of a brake pedal in the deceleration parking stage is marked as zero, the electric braking strength under the opening of the brake pedal is enhanced, the vehicle speed is reduced to zero through electric braking, and the vehicle is controlled to recover energy.
In the related art, if a vehicle is in an urban working condition, a throttle valve can basically slide to recover electric braking to complete a deceleration process, but when the vehicle speed is lower than a vehicle speed threshold value, for example, below 5km/h, no electric braking is involved, and hydraulic braking intervention is needed to complete deceleration, so that the vehicle stops running. And the motor recovery basically exits due to the speed section below 5km/h, and the kinetic energy of the vehicle is wasted at the moment.
Therefore, under the urban working condition, the speed threshold of the electric brake for sliding and recovering the pine valve can be further reduced, namely the speed reduction stage of the urban working condition is completed by the electric brake, the speed is reduced to zero by the electric brake, the vehicle is controlled to recover energy, the recovered electric quantity is further increased, and the resource waste is avoided.
In the related art, if the vehicle is in the suburb working condition, the hydraulic brake intervention is needed in the final deceleration section of the suburb working condition. The hydraulic brake is intervened for a long time, the kinetic energy of the vehicle is consumed to achieve the aim of speed reduction, and the recovery strength of the motor is low.
Therefore, the hydraulic curve of the deceleration section corresponding to the opening of the brake pedal can be marked as 0, namely, the deceleration section is marked as a partial opening idle stroke, meanwhile, the electric braking strength of the brake pedal is enhanced to make up for the braking requirement of the pedal opening in a non-hydraulic state, the vehicle speed is reduced to zero through electric braking, the vehicle is controlled to carry out energy recovery, the recovered electric quantity is increased, and the endurance mileage is increased.
The embodiment of the invention provides a method for controlling a pure electric vehicle based on a NEDC working condition. Therefore, the situation that power consumption equipment such as a water pump is always in a working state to cause energy consumption waste of the vehicle can be avoided, the energy utilization rate of the pure electric vehicle based on the NEDC working condition can be improved, and the endurance mileage of the vehicle is further prolonged.
Optionally, the NEDC working condition is a standard for conventionally testing the comprehensive mileage of the new energy vehicle, so that based on the scheme that the increase of the endurance mileage of the pure electric vehicle can be realized under the working condition, the saved energy consumption and the increased endurance mileage of the pure electric vehicle under different control schemes can be more visually embodied in a quantized manner, and the subsequent further adjustment of the energy consumption optimization of the pure electric vehicle is facilitated.
Optionally, if the current motor temperature is lower than the low-temperature threshold, the electronic fan is controlled to stop working, so that the electronic fan can be prevented from being in a working state all the time, and energy consumption is reduced.
Taking the vehicle under the NEDC working condition as an example, a specific pure electric vehicle control method is provided, wherein part of energy consumption saving data is determined based on the GB/T18386-2005 electric vehicle energy consumption rate and driving range test method. Referring to fig. 2, the method includes:
s201: obtaining a current motor temperature T 0 ；
S202: current motor temperature T 0 Whether or not within the temperature range [ T ] 1 ，T 2 If yes, executing step S203, if no, executing step S209;
that is, if T 1 ≤T 0 ≤T 2 Then step S203 is executed, if T is 0 ＞T 2 Or T 0 ＜T 1 Then step S209 is performed.
S203: and the water pump is controlled to work intermittently by the PWM control signal.
Optionally, the motor is cooled based on cooling water driven by the water pump.
In one embodiment, through experiments, the PWM control technology is adopted to control the water pump in the full endurance test process, the working time of the water pump is halved, and the accumulated energy consumption of the water pump in the endurance test is saved by about 0.42kwh.
S204: current motor temperature T 0 Whether it is higher than the first high temperature threshold T max1 If yes, go to step S205.
Optionally, if the current motor temperature T 0 Not higher than the first high temperature threshold T max1 Step S201 is performed.
S205: if the water pump is in a working state, executing the step S206 if the water pump is in the working state, and executing the step S205 if the water pump is not in the working state;
s206: and controlling the electronic fan to work.
Optionally, the electronic fan is used for dissipating heat from the cooling water.
S207: current motor temperature T 0 Whether or not it is below the low temperature threshold T min If yes, go to step S208, otherwise go to step S206;
s208: and controlling the electronic fan to stop working.
Optionally, if the first high temperature threshold T max1 The temperature is 45 ℃, the low-temperature threshold value is 40 ℃, and at the moment, the current motor temperature is higher than 45 ℃, the electronic fan is started and is in a working state; when in useThe temperature of the front motor is lower than 40 ℃, the electronic fan is closed, and the work is stopped. The current is maintained at about 15A when the electronic fan is turned on. And during the fan off phase, the current motor temperature is still below 40 ℃.
Thus, the electronic fan operating time can be further compressed, i.e., early off, late on. In one experiment, during the full endurance test, one of the single cycles was selected for analysis, which was reduced from the original 257 seconds on time to 157 seconds in the single cycle. The accumulated energy consumption of the electronic fan in the full endurance test is saved by about 0.18kwh.
S209: current motor temperature T 0 Whether it is higher than a second high temperature threshold T max2 If yes, go to step S210.
Optionally, if the current motor temperature T 0 Not higher than a second high temperature threshold T max2 Step S201 may be performed.
S210: and controlling the water pump to be in a continuous working state.
At this moment, the motor temperature is too high, if the cooling capacity to the motor is too weak, will probably bring the influence to the motor normal work, and then influence the vehicle and normally travel, so, need control water pump continuous operation, the reinforcing is to the cooling effect of motor.
Optionally, at this time, the flow rate of the cooling water in the water pump may be controlled according to the current motor temperature. For example, the greater the current motor temperature, the greater the cooling water flow rate, and the positive correlation between the two. For another example, a plurality of flow rate levels of the cooling water may be set, and the flow rate of the cooling water may be determined by determining which current motor temperature range the current motor temperature falls into, corresponding to a plurality of current motor temperature ranges.
Optionally, if the water pump is in a continuous working state, the step S204 is continuously executed, and if the condition is met, the electronic fan is controlled to work to cool the cooling water, so as to achieve better cooling of the motor.
S211: and acquiring the bus current of the low-voltage platform.
It should be noted that the low-voltage platform bus current, that is, the total current, may be obtained through the existing technical solution, and is not limited herein.
S212: and whether the low-voltage platform bus current is smaller than the current threshold value or not, if so, executing step S213, and if not, executing step S217.
S213: and a standby power supply is adopted for supplying power.
Optionally, the standby power supply is connected in parallel with the voltage conversion module.
Alternatively, the number of the standby power supplies may be one or more.
S214: the voltage of the backup power supply is acquired.
S215: if the voltage is less than the voltage threshold, step S216 is executed.
S216: and controlling the voltage conversion module to supply power for the standby power supply.
S217: and a voltage conversion module is adopted for supplying power.
Optionally, the standby power supply and the voltage conversion module (DCDC module) are both 12V power supplies, and are used for supplying power to relevant components of the vehicle.
S218: and acquiring the current working condition information of the vehicle.
S219: and if the current working condition information comprises urban working conditions, reducing the vehicle speed to zero through electric braking, and controlling the vehicle to recover energy.
S220: and if the current working condition information comprises suburb working conditions and the opening of the accelerator pedal is zero, reducing the vehicle speed to zero through electric braking, and controlling the vehicle to recover energy.
For example, in the related art, under urban working conditions, the electric brake can be recovered by sliding the pine oil door to complete the deceleration process, but when the vehicle speed is reduced to below 5km/h, no motor brake is needed, hydraulic brake intervention is needed, and at this time, the kinetic energy of the vehicle is wasted. By adopting the embodiment of the invention, the speed threshold value of the sliding recovery electric brake of the throttle valve is further reduced to 0, namely, the deceleration section of the urban working condition is completed by the electric brake, so that the recovery electric quantity is further increased. The accumulated recovery in the full endurance test is increased by about 0.24kwh, and the endurance capacity of the vehicle is improved. Taking the urban circulation in the GB/T18386-2005 electric vehicle energy consumption rate and driving range test method as an example, when the accumulated time is 23-49 seconds, 85-117 seconds, 178-195 seconds, the vehicle is in a deceleration parking state, in the conventional method, after the vehicle speed of the vehicle is reduced to a certain degree, the electric brake is quitted, and the last vehicle deceleration is completed by intervention of the hydraulic brake until the vehicle speed is zero.
For example, in the full endurance test process, the suburban working condition part in a single NEDC cycle is selected for analysis, usually, the last deceleration section of the suburban working condition needs hydraulic braking intervention, the kinetic energy of the vehicle is consumed to achieve the deceleration purpose through the long-time intervention of the hydraulic braking, and the recovery strength of the motor is low. By adopting the scheme provided by the embodiment of the invention, the hydraulic curve of the deceleration section corresponding to the opening of the brake pedal is marked as 0, namely, the hydraulic curve is marked as a part of opening idle stroke, and meanwhile, the electric braking strength of the brake pedal is enhanced, so that the braking requirement of the pedal opening in a non-hydraulic state is made up, the recovered electric quantity is increased, and the cruising ability of the vehicle is improved. Taking the suburb cycle in the GB/T18386-2005 electric vehicle energy consumption rate and driving range test method as an example, when the accumulated time is 346 seconds to 400 seconds, the vehicle is in a decelerated parking state, in the conventional method, after the accelerator pedal opening is zero, the brake pedal opening is increased from zero, at this time, the hydraulic brake intervenes, the electric brake participation degree is low, and the motor recovery strength is low, whereas in the method provided in this embodiment, the hydraulic curve corresponding to the brake pedal opening at this stage is marked as 0, that is, as a partial opening idle stroke, and at the same time, the electric brake strength of the brake pedal is increased to make up for the brake demand of the pedal opening in a no-hydraulic state, increasing the recoverable energy, achieving "power on", and further increasing the driving range of the electric vehicle.
Example two
Referring to fig. 3, an embodiment of the present invention further provides a vehicle 300, including:
the temperature acquisition module 301 is used for acquiring the current motor temperature;
the water pump control module 302 is used for controlling the water pump to work intermittently if the current temperature of the motor is within a temperature range, and radiating heat of the motor through cooling water of the water pump;
and the electronic fan control module 303 is configured to control the electronic fan to work if the current motor temperature is higher than the first high temperature threshold value, and the water pump is in a working state, where the electronic fan is used for dissipating heat of the cooling water.
In some embodiments, further comprising:
and the current acquisition module is used for acquiring the low-voltage platform bus current, and if the low-voltage platform bus current is smaller than a current threshold, the standby power supply is adopted for supplying power and is connected with the voltage conversion module in parallel.
In some embodiments, if the vehicle is in the NEDC operating condition, the method further comprises:
the working condition acquisition module is used for acquiring the current working condition information of the vehicle;
the first energy recovery module is used for reducing the speed of the vehicle to zero through electric braking and controlling the vehicle to recover energy if the current working condition information comprises urban working conditions and the opening of an accelerator pedal of the vehicle is zero;
and the second energy recovery module is used for reducing the vehicle speed to zero through electric braking and controlling the vehicle to recover energy if the current working condition information comprises suburb working conditions and the opening of the accelerator pedal is zero.
In this embodiment, the vehicle is substantially provided with a plurality of modules for executing the control method of the pure electric vehicle according to the first embodiment, and specific functions and technical effects are only referred to the first embodiment, and are not described herein again.
The embodiment of the invention also provides a pure electric vehicle control device which executes the pure electric vehicle control method in any one of the embodiments.
Alternatively, the pure electric vehicle may be a manually and/or automatically driven vehicle, which is not limited herein.
Specific functions and technical effects of the pure electric vehicle can be achieved by referring to the first embodiment, and details are not repeated here.
Referring to fig. 4, an embodiment of the present invention further provides a terminal 400, which includes a processor 401, a memory 402, and a communication bus 403;
a communication bus 403 is used to connect the processor 401 and the memory 402;
the processor 401 is configured to execute a computer program stored in the memory 402 to implement the method for controlling a pure electric vehicle based on NEDC operating conditions according to any one of the above-described first embodiments.
Embodiments of the present application also provide a non-volatile readable storage medium, where one or more modules (programs) are stored in the storage medium, and when the one or more modules are applied to a device, the one or more modules may cause the device to execute instructions (instructions) included in an embodiment of the present application.
Embodiments of the present invention further provide a computer-readable storage medium, wherein a computer program is stored thereon, and the computer program is configured to enable a computer to execute the method for controlling a pure electric vehicle based on NEDC operating conditions according to any one of the above embodiments.
It should be noted that the computer readable medium in the present disclosure can be a computer readable signal medium or a computer readable storage medium or any combination of the two. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples of the computer readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present disclosure, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In contrast, in the present disclosure, a computer readable signal medium may comprise a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: electrical wires, optical cables, RF (radio frequency), etc., or any suitable combination of the foregoing.
The computer readable medium may be embodied in the electronic device; or may be separate and not incorporated into the electronic device.
Computer program code for carrying out operations for aspects of the present disclosure may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, smalltalk, C + +, and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (10)

1. A pure electric vehicle control method based on an NEDC working condition is characterized by comprising the following steps:
acquiring the current motor temperature;
if the current motor temperature is higher than a second high temperature threshold value and lower than an alert temperature, controlling the water pump to be in a continuous working state, and controlling the flow rate of the cooling water according to the current motor temperature, wherein the alert temperature is higher than the second high temperature threshold value and higher than the highest temperature in the temperature range, and the flow rate of the cooling water is kept to be consistent with the flow rate of the cooling water during the operation of the water pump;
if the current motor temperature is higher than a first high-temperature threshold, the water pump is in a working state, an electronic fan is controlled to work, the electronic fan is used for radiating heat of the cooling water, and the first high-temperature threshold is the temperature within the temperature range or the highest temperature within the temperature range.
2. A pure electric vehicle control method based on NEDC operating conditions according to claim 1, characterized by further comprising:
if the current motor temperature is lower than a low-temperature threshold value, controlling the electronic fan to stop working;
and the control of the intermittent operation of the water pump for cooling the motor comprises the control of the intermittent operation of the water pump through a PWM control signal.
3. A pure electric vehicle control method based on NEDC operating conditions according to any one of claims 1 or 2, characterized by further comprising:
and obtaining the bus current of the low-voltage platform, and if the bus current of the low-voltage platform is smaller than a current threshold value, supplying power by using a standby power supply which is connected with the voltage conversion module in parallel.
4. A pure electric vehicle control method based on the NEDC working condition according to claim 3, characterized by further comprising:
and acquiring the voltage of the standby power supply, and controlling the voltage conversion module to charge the standby power supply if the voltage is smaller than a voltage threshold.
5. A pure electric vehicle control method based on NEDC operating conditions according to any one of claims 1 or 2, characterized by further comprising:
acquiring current working condition information of a vehicle;
if the current working condition information comprises urban working conditions and the opening of an accelerator pedal is zero, reducing the speed of the vehicle to zero through electric braking, and controlling the vehicle to recover energy;
and if the current working condition information comprises suburb working conditions and the opening of the accelerator pedal is zero, reducing the speed of the vehicle to be zero through electric braking, and controlling the vehicle to recover energy.
6. The pure electric vehicle control method based on the NEDC working condition according to claim 5, wherein if the current working condition information includes an urban working condition, the reducing the vehicle speed to zero by electric braking, and controlling the vehicle to perform energy recovery comprises:
if the vehicle is in an automatic driving state, the current working condition information comprises urban working conditions, the vehicle speed threshold value of the throttle valve sliding recovery electric brake is adjusted to be zero, the vehicle speed is reduced to be zero through the electric brake, and the vehicle is controlled to carry out energy recovery.
7. A pure electric vehicle control method based on the NEDC working condition according to claim 5, wherein if the current working condition information comprises suburban working conditions and an accelerator pedal opening is zero, the vehicle speed is reduced to zero through electric braking, and the vehicle is controlled to perform energy recovery comprises the following steps:
if the vehicle is in an automatic driving state, the current working condition information comprises a suburb working condition, the opening of an accelerator pedal is zero, the vehicle is in a suburb circulating deceleration parking stage, a hydraulic curve under the opening of a brake pedal in the deceleration parking stage is marked as zero, the electric brake strength under the opening of the brake pedal is enhanced, the vehicle speed is reduced to zero through electric brake, and the vehicle is controlled to carry out energy recovery.
8. A vehicle, characterized by comprising:
the temperature acquisition module is used for acquiring the current motor temperature;
the water pump control module is used for controlling a water pump to work intermittently if the current motor temperature is within a temperature range, radiating heat for the motor through cooling water of the water pump, acquiring temperature conversion values of the water inlet temperature and the water outlet temperature of the motor, determining the flow rate of the cooling water driven by the water pump, or acquiring a plurality of temperature change values of the water inlet temperature and the water outlet temperature of the motor within preset time, determining the flow rate of the cooling water driven by the water pump according to the change amplitude of each temperature change value, controlling the water pump to be in a continuous working state if the current motor temperature is higher than a second high temperature threshold, and controlling the flow rate of the cooling water according to the current motor temperature, wherein the controlling the flow rate of the cooling water according to the current motor temperature comprises the steps of keeping the flow rate of the cooling water if the current motor temperature is higher than the second high temperature threshold and lower than an alert temperature, and increasing the flow rate of the cooling water if the current motor temperature is higher than the alert temperature, wherein the alert temperature is higher than the second high temperature threshold, and the flow rate of the cooling water is kept at the highest temperature in the temperature range, and the flow rate of the cooling water is kept consistent with the flow rate of the cooling water when the last pump works;
and the electronic fan control module is used for controlling the electronic fan to work if the current motor temperature is higher than a first high-temperature threshold value, the electronic fan is used for radiating heat of the cooling water, and the first high-temperature threshold value is the temperature within the temperature range or the highest temperature within the temperature range.
9. A terminal comprising a processor, a memory, and a communication bus;
the communication bus is used for connecting the processor and the memory;
the processor is configured to execute the computer program stored in the memory to implement the NEDC operating condition-based all-electric vehicle control method according to any one of claims 1 to 7.
10. A computer-readable storage medium, having stored thereon a computer program for causing a computer to execute the NEDC condition-based all-electric vehicle control method according to any one of claims 1 to 7.
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