CN111497820A - Vehicle and fuel cell power control method and system - Google Patents

Vehicle and fuel cell power control method and system Download PDF

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Publication number
CN111497820A
CN111497820A CN201910093668.8A CN201910093668A CN111497820A CN 111497820 A CN111497820 A CN 111497820A CN 201910093668 A CN201910093668 A CN 201910093668A CN 111497820 A CN111497820 A CN 111497820A
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power
fuel cell
vehicle
set multiple
speed
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CN111497820B (en
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王旭
苏常军
赵金宝
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Zhengzhou Yutong Group Co ltd
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Zhengzhou Yutong Group Co ltd
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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
    • B60W10/28—Conjoint control of vehicle sub-units of different type or different function including control of fuel cells
    • 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
    • B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
    • B60W40/02—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models related to ambient conditions
    • 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
    • B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
    • B60W40/10—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models related to vehicle motion
    • B60W40/105—Speed
    • 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
    • B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
    • B60W40/12—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models related to parameters of the vehicle itself, e.g. tyre models
    • B60W40/13—Load or weight
    • 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
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/40—Application of hydrogen technology to transportation, e.g. using fuel cells

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Mathematical Physics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Fuel Cell (AREA)

Abstract

The invention provides a vehicle and a fuel cell power control method and system, and belongs to the technical field of fuel cell automobiles. The fuel cell power control method includes the steps of: acquiring the speed of a front vehicle; determining first power according to the whole vehicle mass of the current vehicle and the vehicle speed of the front vehicle, and taking the first power as second power when the first power is smaller than the limited charging power of the power battery of a first set multiple, or taking the limited charging power of the power battery of the first set multiple as the second power; and then comparing the second power with the maximum power of the fuel cell of a second set multiple, when the second power is smaller than the maximum power of the fuel cell of the second set multiple, controlling the fuel cell by taking the second power as the target power of the fuel cell, otherwise, controlling the fuel cell by taking the maximum power of the fuel cell of the second set multiple as the target power of the fuel cell. The estimated target power of the fuel cell by the method better meets the power requirement of the whole vehicle.

Description

Vehicle and fuel cell power control method and system
Technical Field
The invention relates to a vehicle and a fuel cell power control method and system, and belongs to the technical field of fuel cell automobiles.
Background
A fuel cell is a chemical device that directly converts chemical energy possessed by a fuel into electrical energy. Because the fuel cell needs a certain chemical reaction time to respond to the target power required by the whole vehicle, the power required by a driver is not easy to output along with the opening degree of the accelerator in the use process of the fuel cell vehicle, and the power cell is usually required to be used as a supplementary power supply to make up for the defect that the response power of the fuel cell is not timely.
At present, the control Of the power Of a fuel cell is mostly determined according to the SOC (State Of Charge) value Of a power battery, for example, the invention patent application document with application publication number CN107264324A discloses an energy control method Of a fuel cell vehicle, which realizes reasonable distribution Of energy Of the whole vehicle by obtaining the SOC value Of the power battery and controlling the working mode Of the fuel cell according to the SOC value Of the power battery. According to the control method, the working mode of the fuel cell is controlled only according to the SOC value of the power cell, so that the determined target power of the fuel cell is greatly different from the actually required power value of the whole vehicle, and the driving feeling of the vehicle is influenced.
Disclosure of Invention
The invention aims to provide a fuel cell power control method, which is used for solving the problem that the difference between the determined target power of a fuel cell and the power requirement of a finished automobile is large because the target power of the fuel cell is determined only by adopting the SOC value of a power cell at present; the invention also provides a fuel cell power control system, which is used for solving the problem that the difference between the determined target power of the fuel cell and the power requirement of the whole vehicle is large because the target power of the fuel cell is determined only by adopting the SOC value of the power cell at present; the invention also provides a vehicle, which is used for solving the problem that the target power of the fuel cell is determined only by adopting the SOC value of the power cell at present, so that the difference between the determined target power of the fuel cell and the power requirement of the whole vehicle is large, and the driving feeling of the vehicle is poor.
To achieve the above object, the present invention provides a fuel cell power control method including the steps of:
1) acquiring road condition information in front of a vehicle, wherein the road condition information in front of the vehicle comprises the speed of the vehicle in front;
2) determining first power according to the whole vehicle mass of the current vehicle and the vehicle speed of the front vehicle;
3) judging whether the first power is smaller than the limited charging power of the power battery of a first set multiple, if so, taking the first power as the second power, otherwise, taking the limited charging power of the power battery of the first set multiple as the second power, wherein the value range of the first set multiple is 0.8-0.9;
4) and comparing the second power with the maximum power of the fuel cell of a second set multiple, if the second power is smaller than the maximum power of the fuel cell of the second set multiple, controlling the fuel cell by taking the second power as the target power of the fuel cell, otherwise, controlling the fuel cell by taking the maximum power of the fuel cell of the second set multiple as the target power of the fuel cell, wherein the value range of the second set multiple is 0.8-0.9.
The fuel cell power control method has the beneficial effects that: introducing the road condition information in front of the vehicle as a power control signal of the fuel cell, firstly processing the road condition information in front of the vehicle, and estimating the target power (namely first power) required by the next road condition of the whole vehicle; then, the estimated first power and the power battery limit charging power are combined, and the power (namely, the second power) required by the fuel battery to be output to meet the target power required by the next road condition of the whole vehicle is estimated; and finally, estimating the power which can be output by the fuel cell as the target power of the fuel cell by combining the estimated second power and the maximum power of the fuel cell, and controlling the fuel cell according to the target power of the fuel cell. Therefore, when the target power of the fuel cell is calculated, the information of the road condition in front of the vehicle, the limited charging power of the power cell and the maximum power of the fuel cell are comprehensively considered, so that the estimated target power of the fuel cell better meets the power requirement of the whole vehicle; in addition, the method realizes the pre-estimation of the target power of the fuel cell by utilizing the road condition information in front of the vehicle, thereby controlling the fuel cell to enter the power change in advance according to the estimated target power of the fuel cell, ensuring that the fuel cell can output the target power when the vehicle reaches the next road condition, shortening the response time and ensuring that the fuel cell can respond to the power demand of the whole vehicle more timely.
As an improvement to the above fuel cell power control method, the vehicle speed of the preceding vehicle in step 1) refers to an average vehicle speed of all vehicles within a set distance range ahead of the current vehicle, on the basis of determining the first power, in order to obtain the vehicle speed of the preceding vehicle.
In order to make the acquired vehicle speed of the front vehicle more conform to the self condition of the vehicle and the actual road condition, as another improvement of the fuel cell power control method, the vehicle speed of the front vehicle in the step 1) refers to an average vehicle speed of each vehicle, of which the vehicle speed is less than the limited vehicle speed of the current vehicle, within a preset distance range in front of the current vehicle.
In order to calculate the first power, the invention provides a calculation formula adopted by the first power: the calculation formula adopted by the first power in the step 2) is as follows:
P1＝maVfront side
Wherein, P1For the first power, m is the total vehicle mass of the current vehicle, a is the fixed acceleration value, VFront sideIs the forward vehicle speed.
The invention also provides a fuel cell power control system, which comprises a visual sensor and a controller, wherein the visual sensor is used for acquiring the speed of the front vehicle, the controller is used for determining first power according to the finished vehicle mass of the current vehicle and the speed of the front vehicle, and when the first power is smaller than the power battery limit charging power of a first set multiple, the first power is used as second power, otherwise, the power battery limit charging power of the first set multiple is used as the second power; then comparing the second power with the maximum power of the fuel cell of a second set multiple, when the second power is smaller than the maximum power of the fuel cell of the second set multiple, controlling the fuel cell by taking the second power as the target power of the fuel cell, otherwise, controlling the fuel cell by taking the maximum power of the fuel cell of the second set multiple as the target power of the fuel cell; the value range of the first set multiple is 0.8-0.9, and the value range of the second set multiple is 0.8-0.9.
The fuel cell power control system has the beneficial effects that: the method comprises the following steps that the speed of a front vehicle acquired by a vision sensor is used as a power control signal of a fuel cell, a controller firstly processes road condition information in front of the vehicle, and the target power (namely first power) required by the next road condition of the whole vehicle is estimated; then, the estimated first power and the power battery limit charging power are combined, and the power (namely, the second power) required by the fuel battery to be output to meet the target power required by the next road condition of the whole vehicle is estimated; and finally, estimating the power which can be output by the fuel cell as the target power of the fuel cell by combining the estimated second power and the maximum power of the fuel cell, and controlling the fuel cell according to the target power of the fuel cell. Therefore, when the controller of the control system calculates the target power of the fuel cell, the speed of a front vehicle, the limited charging power of the power cell and the maximum power of the fuel cell are comprehensively considered, so that the estimated target power of the fuel cell better meets the power requirement of the whole vehicle; in addition, the controller of the control system realizes the pre-estimation of the target power of the fuel cell by utilizing the vehicle speed of the vehicle in front, so that the fuel cell can be controlled to enter power change in advance according to the estimated target power of the fuel cell, the fuel cell can output the target power when the vehicle reaches the next road condition, the response time is shortened, and the fuel cell can respond to the power demand of the whole vehicle more timely.
In order to make the control process in the control system more convenient to implement, as an improvement on the above fuel cell power control system, the controller is a vehicle controller.
In order to calculate the first power, the invention provides a calculation formula adopted by the first power: the calculation formula adopted by the first power is as follows:
P1＝maVfront side
Wherein, P1Is the first workThe rate, m, is the total vehicle mass of the current vehicle, a is the fixed acceleration value, VFront sideIs the forward vehicle speed.
The invention also provides a vehicle, which comprises a vehicle controller, a fuel cell and a power battery, and further comprises a visual sensor arranged on the vehicle and used for acquiring the speed of the vehicle in front, wherein the visual sensor is connected with the vehicle controller; then comparing the second power with the maximum power of the fuel cell of a second set multiple, when the second power is smaller than the maximum power of the fuel cell of the second set multiple, controlling the fuel cell by taking the second power as the target power of the fuel cell, otherwise, controlling the fuel cell by taking the maximum power of the fuel cell of the second set multiple as the target power of the fuel cell; the value range of the first set multiple is 0.8-0.9, and the value range of the second set multiple is 0.8-0.9.
The beneficial effect of this vehicle is: the vehicle speed of a front vehicle acquired by a visual sensor is used as a power control signal of a fuel cell, a vehicle controller firstly processes road condition information in front of the vehicle and estimates target power (namely first power) required by the next road condition of the whole vehicle; then, the estimated first power and the power battery limit charging power are combined, and the power (namely, the second power) required by the fuel battery to be output to meet the target power required by the next road condition of the whole vehicle is estimated; and finally, estimating the power which can be output by the fuel cell as the target power of the fuel cell by combining the estimated second power and the maximum power of the fuel cell, and controlling the fuel cell according to the target power of the fuel cell. Therefore, when the vehicle controller of the vehicle calculates the target power of the fuel cell, the vehicle speed of the front vehicle, the limited charging power of the power cell and the maximum power of the fuel cell are comprehensively considered, so that the estimated target power of the fuel cell better meets the power requirement of the whole vehicle, and the running feeling of the vehicle is improved; in addition, the vehicle controller of the vehicle realizes the pre-estimation of the target power of the fuel cell by using the vehicle speed of the vehicle in front, so that the fuel cell can be controlled to enter power change in advance according to the estimated target power of the fuel cell, the fuel cell can output the target power when the vehicle reaches the next road condition, the response time is shortened, the fuel cell can respond the power requirement of the vehicle more timely, and the vehicle running feeling is further improved.
Drawings
FIG. 1 is a flow chart of a fuel cell power control method of an embodiment of the present invention;
fig. 2 is a schematic view of the vehicle structure of the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fuel cell power control method embodiment:
as shown in fig. 1, the fuel cell power control method of the present embodiment includes the steps of:
1) obtaining the speed V of the front vehicleFront side。
Specifically, the average speed of all vehicles within a set distance range in front of the current vehicle (for example, within x meters in front of the current vehicle, where the value of x can be adjusted according to the detection distance of the vision sensor and the current vehicle speed) is obtained by using the vision sensor as the speed V of the front vehicleFront side. Assuming that n vehicles are in front of the current vehicle within x meters, the speed of the n vehicles in front of the current vehicle within x meters can be obtained by using the vision sensor and recorded as V1、V2、V3、…、VnAnd calculating the average speed of the n vehicles as the speed V of the front vehicleFront side。
In another embodiment, the vision sensor may be used to obtain that the vehicle speed is lower than the limited vehicle speed V within the preset distance range ahead of the current vehicleLimit ofIs taken as the average vehicle speed of each vehicle as the frontSpeed V of square vehicleFront side. Assuming that n vehicles are in front of the current vehicle within x meters, the speed of the n vehicles in front of the current vehicle within x meters can be obtained by using the vision sensor and recorded as V1、V2、V3、…、VnThen the speed of the n vehicles is respectively matched with the limited speed V of the current vehicleLimit ofBy comparison, take V or lessLimit ofIs taken as the vehicle speed V of the front vehicleFront side. With this embodiment, the acquired vehicle speed V of the preceding vehicle can be setFront sideThe vehicle self condition and the actual road condition are better met.
Wherein the vehicle speed V of the front vehicleFront sideThe vehicle speed of the front vehicle is calculated by the vision sensor according to the acquired vehicle speed information of the front vehicle; if the road condition information in front of the vehicle acquired by the vision sensor under some road conditions includes not only the calculated speed of the vehicle in front but also a road sign (e.g. a speed limit sign), the calculated speed of the vehicle in front is compared with the speed limit information in the speed limit sign under such road conditions, and the small value of the calculated speed of the vehicle in front and the speed limit information in the speed limit sign is taken as the final speed V of the vehicle in frontFront sideThat is, the calculated speed of the front vehicle is corrected by the speed limit information, so that the finally obtained speed V of the front vehicleFront sideThe real road condition is better met; under the condition of road conditions without speed limit signs, the final speed V of the front vehicleFront sideEqual to the calculated vehicle speed of the preceding vehicle.
At the time of acquiring the speed V of the front vehicleFront sideThen, the acquired vehicle speed V of the front vehicle is requiredFront sideProcessing is performed to obtain the target power of the fuel cell, and the fuel cell is controlled according to the target power of the fuel cell (namely, the contents from step 2) to step 5)), in this embodiment, in order to achieve more conveniently, the contents from step 2) to step 5) are implemented by the vehicle control unit; as another embodiment, a controller may be specially configured on the vehicle to implement the contents of step 2) to step 5), which is more convenient and efficient to implement.
2) Calculating a first power P1。
The purpose of this step is to pass the speed V of the vehicle aheadFront sideAnd processing to estimate the target power (namely the first power) required by the next road condition of the whole vehicle.
Specifically, the vision sensor will acquire the vehicle speed V of the preceding vehicleFront sideSending the vehicle speed information to a vehicle control unit, wherein the vehicle control unit controls the vehicle control unit to control the vehicle control unit toFront sideUsing the formula P1＝maVFront sideCalculating a first power P1. Wherein a is a fixed acceleration value obtained by demand calibration, and the value range is 0-5 m/s2。
3) Calculating a second power P2。
The purpose of this step is to estimate the power (i.e. the second power) required by the fuel cell to meet the target power required by the vehicle under the next road condition, by combining the estimated first power and the power cell limit charging power.
Specifically, the vehicle control unit obtains the limited charging power P of the power batteryLimit ofAnd determining the first power P1Whether the charging power is less than the limit charging power mu P of the power battery of the first set multipleLimit ofTo promptly judge P1<μPLimit ofIf yes, the first power P is applied1As a second power, i.e. P2＝P1(ii) a Otherwise, limiting the charging power mu P of the power battery with the first set multipleLimit ofAs a second power, i.e. P2＝μPLimit of。
Wherein the first set multiple mu is a safety coefficient and the value range of the first set multiple mu is 0.8-0.9; power battery limits charging power PLimit ofThe relation between the SOC value of the power battery and the temperature of the power battery is presented in a table form through tests, and in actual operation, the limit charging power P of the power battery can be obtained by inquiring the table after the SOC value of the power battery and the temperature of the power battery are measuredLimit ofWherein the power battery limits the charging power PLimit ofDecreases as the SOC value increases.
The analysis of the calculation method of the second power shows that: when the method is used for estimating the second power, the actual power output capacity and the whole power output capacity of the power battery are comprehensively consideredVehicle power demand. For example: when P is present1>μPLimit ofWhen P is specifiedLimit ofIf the power battery SOC value is smaller, the corresponding power battery SOC value is larger, namely the power battery has sufficient electric quantity, then the power battery can provide most of power for the whole vehicle, namely only a small part of the power of the whole vehicle needs to be provided by the fuel battery, so that the P is enabled2＝μPLimit ofThe power requirement of the whole vehicle can be met; when P is present1<μPLimit ofWhen, explain PLimit ofIf the SOC value of the corresponding power battery is larger, the SOC value of the corresponding power battery is smaller, namely the power battery has lower electric quantity, then the power battery can only provide a small part of power for the whole vehicle, which indicates that most of the power of the whole vehicle needs to be provided by the fuel battery, so that the P value needs to be set2＝P1So as to meet the power requirement of the whole vehicle.
4) Calculating a third power P3。
The purpose of this step is to estimate the power that the fuel cell can output (i.e., the third power) in combination with the estimated second power and the maximum power of the fuel cell.
Specifically, the vehicle control unit transmits the second power P2Fuel cell maximum power β P corresponding to second set multiplemMaking a comparison to judge P2<βPmIf yes, the second power P is applied2As a third power, i.e. P3＝P2Otherwise β P for the maximum power of the fuel cellmAs a third power, i.e. P3＝βPm。
Wherein the value range of the second set multiple β is 0.8-0.9, PmIs the maximum power of the fuel cell, i.e., the maximum power that the fuel cell can output.
Analysis of the method for calculating the third power shows that the method for estimating the third power considers the actual power output capability of the fuel cell, and particularly, the fuel cell is not generally in a full power output state in the actual operation process, so β P is setmAs the power limit value that the fuel cell can output, i.e. the power (i.e. P) that the fuel cell is required to output estimated in step 3)2) SmallAt β PmThen the fuel cell can meet that demand, i.e. can be as per P2The power output is carried out, otherwise, the requirement cannot be met, and the power output can only be carried out according to the power limit value β P which can be output by the fuel cellmCarrying out power output; thus from P2And β PmThe smaller one is selected as P3The actual power output capability of the fuel cell is fully considered.
5) The vehicle control unit converts the third power P3The fuel cell is controlled as a target power of the fuel cell.
To sum up, the fuel cell power control method of this embodiment introduces the road condition information in front of the vehicle as a power control signal of the fuel cell, and first processes the road condition information in front of the vehicle to estimate the target power (i.e., the first power) required by the next road condition of the entire vehicle; then, the estimated first power and the power battery limit charging power are combined, and the power (namely, the second power) required by the fuel battery to be output to meet the target power required by the next road condition of the whole vehicle is estimated; and finally, estimating the power which can be output by the fuel cell as the target power of the fuel cell to control the fuel cell by combining the estimated second power and the maximum power of the fuel cell. Therefore, when the target power of the fuel cell is calculated, the information of the road condition in front of the vehicle, the limited charging power of the power cell and the maximum power of the fuel cell are comprehensively considered, so that the estimated target power of the fuel cell better meets the power requirement of the whole vehicle; in addition, the method realizes that the target power of the fuel cell is pre-estimated by utilizing the road condition information in front of the vehicle, so that the fuel cell can be controlled to enter power change in advance according to the estimated target power of the fuel cell, the fuel cell can output the target power when the next road condition is reached, the response time is shortened, and the fuel cell can respond to the power demand of the whole vehicle more timely; in addition, the limitation of the charging power of the power battery is considered when the target power of the fuel battery is calculated, namely the actual power output capacity of the power battery is considered, so that most of the power required by the whole vehicle is directly supplied by the fuel battery, the charging and discharging times of the power battery can be reduced, the service life of the power battery can be prolonged, and the situation that the temperature of the power battery is too high due to frequent charging and discharging of the power battery can be effectively prevented.
Fuel cell power control system embodiment:
the fuel cell power control system of the embodiment comprises a visual sensor and a vehicle control unit, wherein the visual sensor is used for acquiring the speed of a front vehicle; the vehicle control unit is used for implementing a fuel cell power control method, which is described in detail in the embodiments of the fuel cell power control method and will not be described herein again.
The vision sensor can acquire a front road video image, analyze the acquired front road video image to acquire the speed information and the front road mark of a front vehicle, acquire the speed of the front vehicle by combining the speed information and the front road mark of the front vehicle, and send the speed of the front vehicle to the vehicle control unit.
The embodiment of the vehicle is as follows:
as shown in fig. 2, the vehicle of the present embodiment includes a vehicle controller, and a vision sensor, a power battery, and a fuel cell, which are respectively connected to the vehicle controller.
The vision sensor is used for acquiring the speed of a front vehicle, and the specific introduction of the vision sensor refers to the embodiment of a fuel cell power control system; the power battery and the fuel battery are used for providing driving power required by the vehicle, and the fuel battery can also charge the power battery when the power battery is low in electricity; the vehicle control unit is used for implementing a fuel cell power control method, which is described in detail in the embodiments of the fuel cell power control method and will not be described herein again.

Claims (8)

1. A fuel cell power control method, characterized by comprising the steps of:
1) acquiring road condition information in front of a vehicle, wherein the road condition information in front of the vehicle comprises the speed of the vehicle in front;
2) determining first power according to the whole vehicle mass of the current vehicle and the vehicle speed of the front vehicle;
3) judging whether the first power is smaller than the limited charging power of the power battery of a first set multiple, if so, taking the first power as the second power, otherwise, taking the limited charging power of the power battery of the first set multiple as the second power, wherein the value range of the first set multiple is 0.8-0.9;
4) and comparing the second power with the maximum power of the fuel cell of a second set multiple, if the second power is smaller than the maximum power of the fuel cell of the second set multiple, controlling the fuel cell by taking the second power as the target power of the fuel cell, otherwise, controlling the fuel cell by taking the maximum power of the fuel cell of the second set multiple as the target power of the fuel cell, wherein the value range of the second set multiple is 0.8-0.9.
2. The fuel cell power control method according to claim 1, wherein the preceding vehicle speed in step 1) refers to an average vehicle speed of all vehicles within a set distance range ahead of a current vehicle.
3. The fuel cell power control method according to claim 1, wherein the preceding vehicle speed in step 1) refers to an average vehicle speed of each vehicle whose vehicle speed is less than a current vehicle defined vehicle speed within a current vehicle front set distance range.
4. The fuel cell power control method according to claim 2 or 3, wherein the calculation formula adopted for the first power in the step 2) is:
P1＝maVfront side
Wherein, P1For the first power, m is the total vehicle mass of the current vehicle, a is the fixed acceleration value, VFront sideIs the forward vehicle speed.
5. The fuel cell power control system is characterized by comprising a visual sensor and a controller, wherein the visual sensor is used for acquiring the speed of a front vehicle, the controller is used for determining first power according to the finished vehicle mass of the current vehicle and the speed of the front vehicle, and taking the first power as second power when the first power is smaller than the power cell limit charging power of a first set multiple, otherwise, taking the power cell limit charging power of the first set multiple as the second power; then comparing the second power with the maximum power of the fuel cell of a second set multiple, when the second power is smaller than the maximum power of the fuel cell of the second set multiple, controlling the fuel cell by taking the second power as the target power of the fuel cell, otherwise, controlling the fuel cell by taking the maximum power of the fuel cell of the second set multiple as the target power of the fuel cell; the value range of the first set multiple is 0.8-0.9, and the value range of the second set multiple is 0.8-0.9.
6. The fuel cell power control system of claim 5, wherein the controller is a vehicle control unit.
7. The fuel cell power control system according to claim 5, wherein the first power is calculated by the formula:
P1＝maVfront side
Wherein, P1For the first power, m is the total vehicle mass of the current vehicle, a is the fixed acceleration value, VFront sideIs the forward vehicle speed.
8. A vehicle comprises a vehicle controller, a fuel cell and a power battery, and is characterized by further comprising a vision sensor arranged on the vehicle and used for collecting the speed of the vehicle in front, wherein the vision sensor is connected with the vehicle controller, the vehicle controller is used for determining first power according to the vehicle mass of the current vehicle and the speed of the vehicle in front, and taking the first power as second power when the first power is smaller than the charging power limited by the power battery with a first set multiple, otherwise, taking the charging power limited by the power battery with the first set multiple as second power; then comparing the second power with the maximum power of the fuel cell of a second set multiple, when the second power is smaller than the maximum power of the fuel cell of the second set multiple, controlling the fuel cell by taking the second power as the target power of the fuel cell, otherwise, controlling the fuel cell by taking the maximum power of the fuel cell of the second set multiple as the target power of the fuel cell; the value range of the first set multiple is 0.8-0.9, and the value range of the second set multiple is 0.8-0.9.
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