CN117841972B - Control method, system, equipment and medium for improving dynamic performance by using range extender - Google Patents
Control method, system, equipment and medium for improving dynamic performance by using range extender Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W20/00—Control systems specially adapted for hybrid vehicles
- B60W20/40—Controlling the engagement or disengagement of prime movers, e.g. for transition between prime movers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2520/00—Input parameters relating to overall vehicle dynamics
- B60W2520/10—Longitudinal speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2540/00—Input parameters relating to occupants
- B60W2540/10—Accelerator pedal position
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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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Abstract
The invention provides a control method, a system, equipment and a medium for improving dynamic performance by using a range extender, wherein the control method calculates to obtain driver demand power by obtaining driver wheel end torque, obtains allowable maximum discharge power of a power battery and accessory demand power, and judges whether a triggering condition is met according to the driver demand power, the allowable maximum discharge power and the accessory demand power, wherein the accessory demand power is the sum of the power of all accessories of the whole vehicle in an operating state; if the trigger condition is met, a trigger instruction is generated, and the range extender is triggered to perform power compensation. According to the scheme, the range extender is triggered to carry out power compensation under a certain condition, so that the situations of insufficient vehicle power and slower power acceleration caused by only using the power battery to provide power for the vehicle under a low-temperature environment are avoided, and the stability of the vehicle in power lifting is enhanced.
Description
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a control method, a system, equipment and a medium for improving dynamic performance by using a range extender.
Background
Compared with a pure electric vehicle, the range extender type electric vehicle has the advantages that the capacity of the power battery is small, the discharging capacity of the power battery is insufficient at low temperature, the power performance of the whole vehicle is poor, the range extender is started to generate electricity when the residual electric quantity of the power battery is reduced to a preset value, but the power performance of the power battery is greatly reduced in a low-temperature scene, and the power performance of the vehicle is also greatly attenuated.
Disclosure of Invention
In view of the foregoing drawbacks or shortcomings of the prior art, the present invention is directed to a control method, system, apparatus, and medium for improving dynamic performance using a range extender.
In a first aspect, the present invention provides a control method for improving dynamic performance by using a range extender, including the following steps:
acquiring a driver wheel end required torque;
Calculating to obtain the driver demand power according to the driver wheel end demand torque;
Obtaining allowable maximum discharge power and accessory required power of a power battery, wherein the accessory required power is the sum of the power of all the whole vehicle accessories in an operating state;
judging whether a triggering condition is met according to the driver demand power, the allowable maximum discharge power and the accessory demand power;
And if the trigger condition is met, generating a trigger instruction, wherein the trigger instruction is used for triggering the range extender to perform power compensation.
According to the technical scheme provided by the embodiment of the invention, the method for judging whether the triggering condition is met according to the driver required power, the allowable maximum discharge power and the accessory required power comprises the following steps:
Acquiring the current opening of an accelerator pedal;
If the sum of the driver demand power and the accessory demand power is greater than the allowable maximum discharge power and the current accelerator pedal opening is greater than a first preset threshold, starting timing to obtain a first time length and a second time length; the first duration is a duration in which the sum of the driver demand power and the accessory demand power is greater than the allowable maximum discharge power, and the second duration is a duration in which the current accelerator pedal opening is greater than a first preset threshold;
and if the first time length and the second time length are both longer than the first preset time length, judging that the first trigger condition is met.
According to the technical scheme provided by the embodiment of the invention, the method for judging whether the triggering condition is met according to the driver required power, the allowable maximum discharge power and the accessory required power further comprises the following steps:
Acquiring the real-time speed of a vehicle in real time, and calling a first power preset table to obtain a first power preset value corresponding to the real-time speed; the first power preset table at least comprises a plurality of groups of vehicle speeds and first power preset values corresponding to each group of vehicle speeds;
And if the allowable maximum discharge power of the power battery is smaller than the first power preset value, judging that a second trigger condition is met.
According to the technical scheme provided by the embodiment of the invention, if the triggering condition is met, a triggering instruction is generated, and the method comprises the following steps:
if the second triggering condition is met and the first triggering condition is not met, a second power preset table is called to obtain a second power preset value corresponding to the real-time vehicle speed;
According to the second power preset value, controlling the range extender to output the generated power of the second power preset value, and outputting a first rotating speed and a first torque; and under the condition that the first rotating speed and the first torque are the generated power of the second power preset value, the rotating speed and the torque with the highest efficiency are used.
The second power preset table at least comprises a plurality of groups of vehicle speeds and second power preset values corresponding to each group of vehicle speeds, and the second power preset values are smaller than or equal to the first power preset values.
According to the technical scheme provided by the embodiment of the invention, if the triggering condition is met, a triggering instruction is generated, and the method further comprises the following steps:
if the first trigger condition is met, calculating according to the driver required power, the allowable maximum discharge power and the accessory required power to obtain a reference power value;
Obtaining a third power preset value based on the reference power value and the second power preset value, controlling the range extender to output the generated power of the third power preset value, and outputting a second rotating speed and a second torque; and under the condition that the second rotating speed and the second torque are the generated power of the third power preset value, the power response is the fastest rotating speed and torque.
According to the technical scheme provided by the embodiment of the invention, after the trigger instruction is generated if the trigger condition is met, the method further comprises the following steps:
judging whether an exit condition is met according to the driver demand power, the allowable maximum discharge power and the accessory demand power;
and if the exit condition is met, generating an exit instruction, wherein the exit instruction is used for controlling the range extender to exit the power compensation.
According to the technical scheme provided by the embodiment of the invention, the method for judging whether the exit condition is met according to the driver required power, the allowed maximum discharge power and the accessory required power comprises the following steps:
If the sum of the driver demand power and the accessory demand power is smaller than the allowable maximum discharge power or the current accelerator pedal opening is smaller than a second preset threshold, judging that a first exit condition is met, wherein the first exit condition is used for representing that the first trigger condition is not met;
and if the allowable maximum discharge power is larger than the sum of the first power preset value and the compensation power, judging that a second exit condition is met, wherein the second exit condition is used for representing that the second trigger condition is not met.
In a second aspect, the present application provides a system for enhancing dynamic performance using a range extender, comprising:
The first acquisition module is configured to acquire the torque required by the wheel end of the driver;
the first calculation module is configured to calculate and obtain the driver required power according to the driver wheel end required torque;
the second acquisition module is configured to acquire allowable maximum discharge power of the power battery and accessory required power, wherein the accessory required power is the sum of the power of all the whole vehicle accessories in an operating state;
The first judging module is configured to judge whether a triggering condition is met according to the driver required power, the allowed maximum discharge power and the accessory required power;
the first generation module is configured to generate a trigger instruction if the trigger condition is met, and the trigger instruction is used for triggering the range extender to perform power compensation.
In a third aspect, the present application provides a terminal device comprising a processor and a memory, wherein the memory stores a computer program which, when executed by the processor, causes the processor to perform the steps of the above-described control method for improving dynamic properties using a range extender.
In a fourth aspect, the present application provides a readable storage medium, where a program or an instruction is stored, where the program or the instruction, when executed by a processor, implements a control method for improving dynamic performance using a range extender as described above.
In summary, the present invention provides a control method for improving power performance by using a range extender, which obtains driver demand power by obtaining driver wheel end torque, obtains allowable maximum discharge power of a power battery and accessory demand power, and determines whether a trigger condition is satisfied according to the driver demand power, the allowable maximum discharge power and the accessory demand power, wherein the accessory demand power is a sum of power of all whole vehicle accessories in an operating state; if the trigger condition is met, a trigger instruction is generated, and the range extender is triggered to perform power compensation.
Compared with the prior art, the application has the beneficial effects that: the energy of the power battery can be reduced along with the reduction of the environmental temperature, whether the triggering condition is met or not is judged by the power required by a driver, the maximum allowable discharge power and the power required by accessories, and after the triggering condition is met, a triggering instruction is generated, and the range extender is triggered to carry out power compensation on the vehicle, so that the situations of insufficient power and slower power acceleration of the vehicle caused by only using the power battery to power the vehicle in a low-temperature environment are avoided, and the stability of the vehicle for improving the power is enhanced.
Drawings
FIG. 1 is a flow chart of a control method for improving dynamic performance by using a range extender according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a computer system of a terminal device according to the present invention.
600. A computer system; 601. a CPU; 602. a ROM; 603. a RAM; 604. a bus; 605. an I/O interface; 606. an input section; 607. an output section; 608. a storage section; 609. a communication section; 610. a driver; 611. removable media.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be noted that, for convenience of description, only the portions related to the invention are shown in the drawings.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
Example 1
As mentioned in the background art, the present invention proposes a control method for improving the dynamic performance by using a range extender, where the method may be executed by a whole vehicle controller (Vehicle control unit, VCU), and the whole vehicle controller may be connected to each component of the vehicle by a communication cable or in a wireless manner, or may be connected to each component of the vehicle by a CAN (Controller Area Network ) bus, based on this connection, control of each component of the vehicle may be implemented, and information about an operation state of each component may be collected, for example, the whole vehicle controller may collect a remaining power of a power battery, or may send a control instruction to the range extender controller, or control a controller at a motor end, so as to further control an operation state of a motor.
As shown in fig. 1, the control method includes the steps of:
s1, obtaining a required torque of a wheel end of a driver;
specifically, the vehicle speed and the opening degree of an accelerator pedal can be obtained through VCU, and the driver wheel end required torque is calculated through the vehicle speed and the opening degree of the accelerator pedal and is the power output required by the vehicle wheel end;
S2, calculating according to the driver wheel end required torque to obtain driver required power;
specifically, the driver demand power is calculated by the following formula:
Wherein P d represents the driver demand power in KW; v represents the speed of the vehicle, in kph; t represents the torque required by the wheel end of the driver, and the unit is N.m; r represents the rolling radius of the wheel, and the unit is m; in order to avoid that the driver demand power is calculated to be 0 when the vehicle stationary speed is 0, the vehicle speed is optionally not less than 10kph.
S3, obtaining allowable maximum discharge power of the power battery and accessory required power, wherein the accessory required power is the sum of the power of all the whole vehicle accessories in the running state;
specifically, the remaining capacity of the power battery pack, the temperature of the battery cell of the power battery, and the like all have an influence on the allowable maximum discharge power, and the calculation of the allowable maximum discharge power is completed through the VCU, which is an internal algorithm of the VCU, and belongs to the prior art, and is not repeated herein;
Optionally, the whole vehicle accessory comprises an air conditioner compressor, a PTC (Positive Temperature Coefficient, a heater), a voltage converter and the like; some of the whole vehicle accessories are provided with controllers, and the controllers can calculate the instantaneous power of the whole vehicle accessories and then transmit the power information to the VCU; some of the accessories of the whole vehicle are not provided with controllers, voltage and current signals are acquired through configuration sensors and are transmitted to the VCU, and the power of the accessories of the whole vehicle is calculated in the VCU; and the VCU adds the power of all the whole vehicle accessories to obtain the accessory required power. Setting the allowable maximum discharge power to be P bat and setting the accessory required power to be P acsy.
S4, judging whether a triggering condition is met or not according to the driver required power, the allowed maximum discharge power and the accessory required power;
wherein the triggering condition is a condition allowing the range extender to perform power compensation.
S5, if the trigger condition is met, generating a trigger instruction, wherein the trigger instruction is used for triggering the range extender to perform power compensation.
In summary, compared with the prior art, the invention judges whether the triggering condition is met by the driver demand power, the allowable maximum discharge power and the accessory demand power, and generates the triggering instruction after the triggering condition is met, the range extender is triggered to carry out power compensation on the vehicle, so that the situations of insufficient vehicle power and slower power acceleration caused by using the power battery only to provide power for the vehicle in a low-temperature environment are avoided, and the stability of the vehicle for improving the power is enhanced.
In a preferred embodiment, the determining whether the triggering condition is satisfied according to the driver demand power, the allowable maximum discharge power, and the accessory demand power includes the steps of:
Acquiring the current opening of an accelerator pedal;
If the sum of the driver demand power and the accessory demand power is greater than the allowable maximum discharge power and the current accelerator pedal opening is greater than a first preset threshold, starting timing to obtain a first time length and a second time length; the first duration is a duration in which the sum of the driver demand power and the accessory demand power is greater than the allowable maximum discharge power, and the second duration is a duration in which the current accelerator pedal opening is greater than a first preset threshold;
and if the first time length and the second time length are both longer than the first preset time length, judging that the first trigger condition is met.
Specifically, the first trigger condition is expressed by the following formula:
P d+Pacsy>Pbat and lasting 1s formula (2)
And O p > 80%, and last for 1s formula (3)
Wherein O p represents an accelerator pedal opening.
Specifically, the formula (2) is a relation between powers, but the power may have many limitations, for example, since the allowable maximum discharge power is related to the remaining power of the power battery pack and the temperature of the power battery cell, in some specific situations, if the ambient temperature is low, the allowable maximum discharge power is low, so that the formula (2) is established many times, so that the range extender is frequently started and stopped, and the service performance of the range extender is reduced. Therefore, in order to avoid frequent triggering and frequent exiting of the range extender, judgment of the opening degree of the accelerator pedal is increased, optionally, the first preset threshold value is 80%, and in order to avoid mistaken stepping on the accelerator, it is ensured that the opening degree of the accelerator pedal is always kept to be more than 80% within a set first preset duration, optionally, the first preset duration is 1s.
Optionally, in order to improve the effectiveness of the judgment, the short-time requirement is filtered, the first preset duration is set, that is, when the sum of the driver required power and the accessory required power is greater than the allowable maximum discharge power, the first preset duration is continued, and the current state that the accelerator opening is greater than the first preset threshold is maintained for the first preset duration, the first trigger condition is judged to be met, a corresponding trigger instruction is generated, and the trigger instruction is sent to the controller of the range extender by the VCU.
In a preferred embodiment, the determining whether the triggering condition is met according to the driver demand power, the allowable maximum discharge power, and the accessory demand power further includes the steps of:
Acquiring the real-time speed of a vehicle in real time, and calling a first power preset table to obtain a first power preset value corresponding to the real-time speed; the first power preset table at least comprises a plurality of groups of vehicle speeds and first power preset values corresponding to each group of vehicle speeds;
And if the allowable maximum discharge power of the power battery is smaller than the first power preset value, judging that a second trigger condition is met.
Specifically, the second trigger condition is expressed by the following formula:
P bat＜Pbat_v formula (4)
Wherein P bat_v represents the first power preset value. The value of P bat_v is related to the real-time speed, and can be obtained according to the first power preset table described in table 1, where table 1 is as follows:
TABLE 1 first Power preset Table
| Vehicle speed (kph) | V1 | V2 | ... | Vn |
| First power preset value (KW) | P1 | P2 | ... | Pn |
Specifically, in the design stage, the vehicle rabbet divides the vehicle speed into a plurality of vehicle speed ranges according to the maximum vehicle speed which can be achieved by the vehicle, and sets the acceleration duration corresponding to each vehicle speed range, as shown in table 2:
TABLE 2
| Vehicle speed range | Acceleration duration |
| 0-40kph | T1 |
| 40-80kph | T2 |
| 80-100kph | T3 |
As shown in table 2, for example, the maximum vehicle speed that can be achieved by the vehicle is 100kph, three vehicle speed ranges are obtained, each vehicle speed range corresponds to one acceleration duration, and the power required for reaching the end speed from the initial speed can be calculated according to the acceleration duration, the initial speed and the end speed corresponding to the vehicle speed range when the power battery is full and the range extender is not required to be started, wherein the power is the first power preset value in table 1, and the initial speed in each vehicle speed range is the vehicle speed in table 1. May also be obtained through simulation or testing, and is not described herein.
For example, the acceleration duration corresponding to 40-80kph is 2s, the first power preset value corresponding to 40kph is 80KW obtained through table lookup 1, and when the accessory required power is calculated to be greater than 80KW, it is indicated that if the vehicle reaches the vehicle speed 80kph from the vehicle speed 40kph under the current power, the speed is slower, the acceleration duration is longer, the index of the acceleration duration corresponding to 40-80kph set by the vehicle enterprise is not met, so that the range extender needs to be started to supplement power to boost the current power, the acceleration duration is shortened, and the acceleration duration corresponding to the set vehicle speed range is met.
The VCU is provided with a first power preset table, the first power preset table is shown in table 1, a first power preset value is corresponding to each vehicle speed, the VCU can acquire allowed maximum discharge power and real-time vehicle speed in real time, the first power preset values corresponding to different vehicle speeds are obtained through inquiring of the first power preset table, the sizes of the allowed maximum discharge power and the obtained first power preset values are judged, and when the allowed maximum discharge power is smaller than the first power preset values, the second trigger condition is met.
Therefore, the above embodiment is divided into two triggering conditions according to the driver demand power, the allowable maximum discharge power and the accessory demand power, and different triggering instructions are sent in a targeted manner, so that the range extender performs power compensation, and the practical driving scene is combined, so that the practicability is high.
In a preferred embodiment, if the trigger condition is met, a trigger instruction is generated, including the following steps:
if the second triggering condition is met and the first triggering condition is not met, a second power preset table is called to obtain a second power preset value corresponding to the real-time vehicle speed;
According to the second power preset value, controlling the range extender to output the generated power of the second power preset value, and outputting a first rotating speed and a first torque; and under the condition that the first rotating speed and the first torque are the generated power of the second power preset value, the rotating speed and the torque with the highest efficiency are used.
The second power preset table at least comprises a plurality of groups of vehicle speeds and second power preset values corresponding to each group of vehicle speeds, and the second power preset values are smaller than or equal to the first power preset values.
In this embodiment, for the triggering of the first triggering condition and the second triggering condition, a corresponding triggering instruction is obtained, so as to instruct the range extender to output different parameter values to compensate the power of the vehicle.
Specifically, when the second trigger condition is satisfied and the first trigger condition is not satisfied, the allowable maximum discharge power of the power battery at this time satisfies the driver demand power and the accessory demand power, and the range extender generates electricity at high efficiency. At this time, a second power preset value of the range extender corresponding to the real-time vehicle speed may be obtained by searching according to a second power preset table described in table 3.
Wherein, table 3 is as follows:
TABLE 3 second Power Preset Table
| Vehicle speed | V1 | V2 | V3 | …… | Vn |
| Second power preset value | P Hair brush 1 | P Hair brush 2 | P Hair brush 3 | …… | P Hair brush n |
Specifically, the range extender corresponds to a high-efficiency power interval under different vehicle speeds, and generates power according to the power of the power interval, so that the requirement of power generation with Cheng Qigao efficiency can be met. However, in the low-speed case, if the highest power of the power section is used for power generation, a large noise is generated, and the experience of driving is reduced, so that the generated power of the range extender satisfies the noise requirement in addition to the high-efficiency power section. The appropriate power can be obtained according to the actual test, or the appropriate power can be obtained according to the noise requirement of the vehicle enterprise at each vehicle speed given in the design stage, and the appropriate power is the second power preset value in table 3.
The VCU stores a second power preset table, where the second power preset table is shown in table 3, and when the VCU determines that the second trigger condition is met and the first trigger condition is not met, the VCU obtains a vehicle speed, obtains a second power preset value of the range extender through the lookup table 3, and sends the parameter to a controller of the range extender, and controls the range extender to generate power with the output power of the second power preset value.
Further, the increment Cheng Qiju has a universal characteristic curve, and the rotation speed with highest efficiency corresponding to the first power generation is obtained as a first rotation speed, and the torque with highest efficiency is obtained as a first torque according to the universal characteristic curve.
In a preferred embodiment, if the trigger condition is met, a trigger instruction is generated, and the method further includes the following steps:
if the first trigger condition is met, calculating according to the driver required power, the allowable maximum discharge power and the accessory required power to obtain a reference power value;
Obtaining a third power preset value based on the reference power value and the second power preset value, controlling the range extender to output the generated power of the third power preset value, and outputting a second rotating speed and a second torque; and under the condition that the second rotating speed and the second torque are the generated power of the third power preset value, the power response is the fastest rotating speed and torque.
Specifically, when the first trigger condition is satisfied (whether or not the second trigger condition is satisfied is not considered), at which time the allowable maximum discharge power of the power battery has failed to satisfy the power demand, the range extender requires rapid output power compensation to satisfy the driving demand, at which time the range extender operates at the output power of the third power preset value.
Further, the step of obtaining the third power preset value includes the following steps:
Calculating the reference power value according to the driver demand power, the allowable maximum discharge power and the accessory demand power; calculating according to the following formula;
Wherein, eta represents the power of the generator and can be taken as the average value under the working condition of WLTC (Worldwide Harmonized LIGHT VEHICLES TEST CYCLE, worldwide light automobile test cycle working condition); p EB represents the reference power value;
and comparing the reference power value with the second power preset value, and selecting the larger value of the reference power value and the second power preset value as the third power preset value.
Further, when the first trigger condition is met (whether the second trigger condition is met or not is not considered), the corresponding rotation speed and torque can be obtained through the second power preset value, and at the moment, the allowable maximum discharge power of the power battery cannot meet the requirement, so that the range extender outputs power rapidly to meet the driving requirement, and therefore the rotation speed and torque are obtained according to the fastest power response.
Specifically, the range extender has an external characteristic curve in addition to the universal characteristic curve, and obtains a rotation speed with the fastest power response corresponding to the third power preset value according to the external characteristic curve, and the rotation speed is used as a second rotation speed, and a torque with the fastest power response is used as a second torque.
Therefore, the above embodiment obtains the adaptation mode of the vehicle needing compensation power under the corresponding working condition based on the satisfaction of the first triggering condition and the second triggering condition, and controls the range extender to compensate the power in a compensation power mode under the working condition, so that the technical effects of high response speed and high efficiency of meeting the power promotion can be achieved.
And if the trigger condition is met, generating a trigger instruction, and then, further comprising the following steps:
judging whether an exit condition is met according to the driver demand power, the allowable maximum discharge power and the accessory demand power;
and if the exit condition is met, generating an exit instruction, wherein the exit instruction is used for controlling the range extender to exit the power compensation.
Specifically, the exit condition is stored in the VCU, and when the VCU determines that the exit condition is satisfied, the range extender is controlled to exit the power compensation.
According to the embodiment, when the power battery is enough to meet the power requirement of the vehicle, the power compensation of the range extender is timely terminated, the intelligence of the vehicle is improved, and the service life of the range extender is prolonged.
In a preferred embodiment, the determining whether the exit condition is satisfied according to the driver demand power, the allowable maximum discharge power, and the accessory demand power includes the steps of:
If the sum of the driver demand power and the accessory demand power is smaller than the allowable maximum discharge power or the current accelerator pedal opening is smaller than a second preset threshold, judging that a first exit condition is met, wherein the first exit condition is used for representing that the first trigger condition is not met;
and if the allowable maximum discharge power is larger than the sum of the first power preset value and the compensation power, judging that a second exit condition is met, wherein the second exit condition is used for representing that the second trigger condition is not met.
Specifically, the first exit condition is set corresponding to the first trigger condition, and the second exit condition is set corresponding to the second trigger condition.
Optionally, the second preset threshold is 60%, and the first exit condition is as follows:
o p < 60%, and lasting 1s formula (6)
Or P d+Pacsy＜Pbat and last for 1s formula (7)
Optionally, the compensation power is 20KW, and the second exit condition is as follows:
p bat＞Pbat_v +20 formula (8)
Example 2
On the basis of the embodiment 1, the invention provides a system for improving dynamic performance by using a range extender, which comprises the following components:
The first acquisition module is configured to acquire the torque required by the wheel end of the driver;
the first calculation module is configured to calculate and obtain the driver required power according to the driver wheel end required torque;
The second acquisition module is configured to acquire allowable maximum discharge power of the power battery and accessory required power, wherein the accessory required power is the sum of the power of all the whole vehicle accessories in an operating state;
The first judging module is configured to judge whether a triggering condition is met according to the driver required power, the allowed maximum discharge power and the accessory required power;
the first generation module is configured to generate a trigger instruction if the trigger condition is met, and the trigger instruction is used for triggering the range extender to perform power compensation.
The invention calculates the driver demand power by acquiring the torque of the wheel end of the driver, acquires the allowable maximum discharge power of a power battery and the accessory demand power, and judges whether a trigger condition is met according to the driver demand power, the allowable maximum discharge power and the accessory demand power, wherein the accessory demand power is the sum of the power of all the accessories of the whole vehicle in an operating state; and if the trigger condition is met, generating a trigger instruction, and triggering the range extender to perform power compensation.
Compared with the prior art, the invention judges whether the triggering condition is met by the driver demand power, the allowable maximum discharge power and the accessory demand power, and generates the triggering instruction after the triggering condition is met, so that the range extender is triggered to carry out power compensation on the vehicle, the situations of insufficient vehicle power and slower power acceleration caused by using the power battery only to provide power for the vehicle in a low-temperature environment are avoided, and the stability of the vehicle for improving the power is enhanced. The system provided by the embodiment of the invention can realize each process realized by the embodiment of the method, has corresponding functional modules and beneficial effects, and is not repeated here.
Example 3
As shown in fig. 2, the computer system 600 of the terminal device includes a CPU601, which can perform various appropriate actions and processes according to a program stored in a ROM602 or a program loaded from a storage section 608 into a RAM 603. In the RAM603, various programs and data required for system operation are also stored. The CPU601, ROM602, and RAM603 are connected to each other through a bus 604. An I/O interface 605 is also connected to bus 604. The following components are connected to the I/O interface 605: an input portion 606 including a keyboard, mouse, etc.; an output portion 607 including a Cathode Ray Tube (CRT), a Liquid Crystal Display (LCD), and the like, a speaker, and the like; a storage section 608 including a hard disk and the like; and a communication section 609 including a network interface card such as a LAN card, a modem, or the like. The communication section 609 performs communication processing via a network such as the internet. The drives are also connected to the I/O interface 605 as needed. Removable media 611 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is installed as needed on drive 610 so that a computer program read therefrom is installed as needed into storage section 608.
In particular, the process described above with reference to flowchart 1 may be implemented as a computer software program according to an embodiment of the invention. For example, embodiment 3 of the present invention includes a computer program product comprising a computer program embodied on a computer readable medium, the computer program comprising program code for performing the method shown in the flowchart. In such embodiments, the computer program may be downloaded and installed from a network via a communication portion, and/or installed from a removable medium. When executed by the CPU601, the computer program performs the functions defined above in the present computer system 600.
The computer readable medium shown in the present invention may be a computer readable signal medium or a computer readable storage medium, or any combination of the two. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any 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 context of this document, 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 the present invention, however, the computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, with the computer-readable program code embodied therein. 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 of the foregoing. 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: wireless, wire, fiber optic cable, RF, etc., or any suitable combination of the foregoing.
The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments 3 of the present invention. 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 or flowchart illustration, and combinations of blocks in the block diagrams or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
As another aspect, the present invention also provides a computer-readable medium that may be contained in the electronic device described in the above embodiment; or may exist alone without being incorporated into the electronic device. The computer-readable medium carries one or more programs that, when executed by one of the electronic devices, cause the electronic device to implement the control method for improving dynamic performance using a range extender as described in the above embodiments.
For example, the electronic device may implement the method as shown in fig. 1: s1, obtaining a required torque of a wheel end of a driver; s2, calculating to obtain the driver demand power according to the driver wheel end demand torque; s3, obtaining allowable maximum discharge power of the power battery and accessory required power, wherein the accessory required power is the sum of the power of all the whole vehicle accessories in an operating state; s4, judging whether a triggering condition is met or not according to the driver required power, the allowed maximum discharge power and the accessory required power; and S5, if the triggering condition is met, generating a triggering instruction, wherein the triggering instruction is used for triggering the range extender to perform power compensation.
It should be noted that although in the above detailed description several modules or units of a device for action execution are mentioned, such a division is not mandatory. Indeed, the features and functions of two or more modules or units described above may be embodied in one module or unit in accordance with the disclosed embodiments of the invention. Conversely, the features and functions of one module or unit described above may be further divided into a plurality of modules or units to be embodied.
Furthermore, although the steps of the methods of the present invention are depicted in the accompanying drawings in a particular order, this is not required to or suggested that the steps must be performed in this particular order or that all of the steps shown be performed in order to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step to perform, and/or one step decomposed into multiple steps to perform, etc.
From the above description of embodiments, those skilled in the art will readily appreciate that the example embodiments described herein may be implemented in software, or may be implemented in software in combination with the necessary hardware.
The above description is only illustrative of the preferred embodiments of the present invention and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the invention referred to in the present invention is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present invention (but not limited to) having similar functions are replaced with each other.
Claims (8)
1. A control method for improving dynamic performance by using a range extender is characterized by comprising the following steps:
acquiring a driver wheel end required torque;
Calculating to obtain the driver demand power according to the driver wheel end demand torque;
Obtaining allowable maximum discharge power and accessory required power of a power battery, wherein the accessory required power is the sum of the power of all the whole vehicle accessories in an operating state;
judging whether a triggering condition is met according to the driver required power, the allowable maximum discharge power and the accessory required power;
If the triggering condition is met, generating a triggering instruction, wherein the triggering instruction is used for triggering the range extender to perform power compensation;
The step of judging whether the triggering condition is met according to the driver required power, the allowable maximum discharge power and the accessory required power comprises the following steps:
Acquiring the current opening of an accelerator pedal;
If the sum of the driver demand power and the accessory demand power is greater than the allowable maximum discharge power and the current accelerator pedal opening is greater than a first preset threshold, starting timing to obtain a first time length and a second time length; the first duration is a duration in which the sum of the driver demand power and the accessory demand power is greater than the allowable maximum discharge power, and the second duration is a duration in which the current accelerator pedal opening is greater than a first preset threshold;
If the first time length and the second time length are both longer than a first preset time length, judging that a first trigger condition is met;
And if the trigger condition is met, generating a trigger instruction, and further comprising the following steps:
if the first trigger condition is met, calculating according to the driver required power, the allowable maximum discharge power and the accessory required power to obtain a reference power value;
Obtaining a third power preset value based on the reference power value and the second power preset value, controlling the range extender to output the generated power of the third power preset value, and outputting a second rotating speed and a second torque; the second rotating speed and the second torque are the fastest rotating speed and torque of power response under the power generation power of the third power preset value;
Comparing the reference power value with the second power preset value, and selecting the larger value of the reference power value and the second power preset value as the third power preset value; the second power preset value is a power value which meets the noise requirement in a high-efficiency power interval corresponding to the range extender under the real-time vehicle speed.
2. The control method for improving power performance using a range extender according to claim 1, wherein the step of determining whether a trigger condition is satisfied according to the driver demand power, the allowable maximum discharge power, and the accessory demand power, further comprises the steps of:
Acquiring the real-time speed of a vehicle in real time, and calling a first power preset table to obtain a first power preset value corresponding to the real-time speed; the first power preset table at least comprises a plurality of groups of vehicle speeds and first power preset values corresponding to each group of vehicle speeds;
And if the allowable maximum discharge power of the power battery is smaller than the first power preset value, judging that a second trigger condition is met.
3. The control method for improving dynamic performance using a range extender according to claim 2, wherein the step of generating a trigger command if the trigger condition is satisfied comprises the steps of:
if the second triggering condition is met and the first triggering condition is not met, a second power preset table is called to obtain a second power preset value corresponding to the real-time vehicle speed;
According to the second power preset value, controlling the range extender to output the generated power of the second power preset value, and outputting a first rotating speed and a first torque; the first rotating speed and the first torque are the rotating speed and the torque with highest efficiency under the power generation power of the second power preset value;
The second power preset table at least comprises a plurality of groups of vehicle speeds and second power preset values corresponding to each group of vehicle speeds, and the second power preset values are smaller than or equal to the first power preset values.
4. The control method for improving dynamic performance using a range extender according to claim 2, wherein after generating the trigger command if the trigger condition is satisfied, further comprising the steps of:
judging whether an exit condition is met according to the driver demand power, the allowable maximum discharge power and the accessory demand power;
and if the exit condition is met, generating an exit instruction, wherein the exit instruction is used for controlling the range extender to exit the power compensation.
5. The control method for improving power performance using a range extender according to claim 4, wherein said determining whether an exit condition is satisfied based on said driver demand power, said allowable maximum discharge power, and said accessory demand power comprises the steps of:
If the sum of the driver demand power and the accessory demand power is smaller than the allowable maximum discharge power or the current accelerator pedal opening is smaller than a second preset threshold, judging that a first exit condition is met, wherein the first exit condition is used for representing that the first trigger condition is not met;
and if the allowable maximum discharge power is larger than the sum of the first power preset value and the compensation power, judging that a second exit condition is met, wherein the second exit condition is used for representing that the second trigger condition is not met.
6. A system for enhancing dynamic performance using a range extender for performing the control method for enhancing dynamic performance using a range extender as claimed in any one of claims 1 to 5, comprising:
The first acquisition module is configured to acquire the torque required by the wheel end of the driver;
the first calculation module is configured to calculate and obtain the driver required power according to the driver wheel end required torque;
The second acquisition module is configured to acquire allowable maximum discharge power of the power battery and accessory required power, wherein the accessory required power is the sum of the power of all the whole vehicle accessories in an operating state;
The first judging module is configured to judge whether a triggering condition is met according to the driver required power, the allowed maximum discharge power and the accessory required power;
the first generation module is configured to generate a trigger instruction if the trigger condition is met, and the trigger instruction is used for triggering the range extender to perform power compensation.
7. A terminal device comprising a processor and a memory, wherein the memory stores a computer program which, when executed by the processor, causes the processor to perform the steps of the control method for improving dynamics using a range extender as claimed in any one of claims 1 to 5.
8. A readable storage medium having stored thereon a program or instructions which, when executed by a processor, implement the control method of any one of claims 1-5 for enhancing dynamic performance using a range extender.
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| CN104477041A (en) * | 2014-11-21 | 2015-04-01 | 北京新能源汽车股份有限公司 | Power following control method for range extender of pure electric vehicle |
| CN115123189A (en) * | 2022-06-20 | 2022-09-30 | 东风汽车集团股份有限公司 | Range extender, and control method and device of range extender |
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| CN112590528B (en) * | 2021-03-02 | 2021-06-18 | 比亚迪股份有限公司 | Hybrid power system, hybrid power vehicle, control method of hybrid power vehicle and vehicle control unit |
| CN115839281B (en) * | 2022-11-24 | 2025-07-11 | 广州汽车集团股份有限公司 | Automobile engine speed control method, device, electronic device and storage medium |
| CN116061918A (en) * | 2023-01-19 | 2023-05-05 | 重庆长安新能源汽车科技有限公司 | Power generation method, device, equipment and medium of range-extended hybrid electric vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104477041A (en) * | 2014-11-21 | 2015-04-01 | 北京新能源汽车股份有限公司 | Power following control method for range extender of pure electric vehicle |
| CN115123189A (en) * | 2022-06-20 | 2022-09-30 | 东风汽车集团股份有限公司 | Range extender, and control method and device of range extender |
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