阅读说明：本技术 一种燃料电池的动态响应控制方法 (Dynamic response control method of fuel cell ) 是由 郭庆光 张善星 袁文文 于 2021-08-27 设计创作，主要内容包括：本发明涉及纯电动车辆技术领域,公开了一种燃料电池的动态响应控制方法,燃料电池的动态响应控制方法中,在燃料电池的输出功率变更到目标输出功率之前,先在原来的功率的附近上下动态相应起来,可以有效延长燃料电池的寿命,且当VCU需求燃料电池变更到下一档,也就是变更到目标功率时,燃料电池可以更快的相应VCU的需求功率,提高了燃料电池的响应速度。(The invention relates to the technical field of pure electric vehicles, and discloses a dynamic response control method of a fuel cell.)

1. A dynamic response control method of a fuel cell, characterized by comprising:

a. acquiring the current output power P of a fuel cell in a mode that the fuel cell operates at constant power₁Acquiring the current SOC of the power battery;

b. judging whether the output power of the fuel cell needs to be changed or not according to the acquired current power cell SOC;

c. determining a control mode of the fuel cell according to the judgment result;

if the output power of the fuel cell needs to be changed:

1) determining the target output power P of the fuel cell after the fuel cell needs to be changed according to the obtained current power cell SOC₂；

2) To the fuelThe fuel cell sends a first power change demand to make the output power of the fuel cell be greater than or equal to P₁- Δ P and less than or equal to P₁Within the range of + Δ P so that the output power of the fuel cell is changed at the present output power P₁Where Δ P is the amount of power change, and P is the amount of power change₁Is not less than Δ P, and | - [ P ]₂-P₁∣＞ΔP；

3) And sending a second change request to the fuel cell to change the output power of the fuel cell to the target output power P₂Keeping the constant, and turning to the step a;

and if the output power of the fuel cell does not need to be changed, continuing to operate at the current constant power, and turning to the step a.

2. The dynamic response control method of a fuel cell according to claim 1, characterized by further comprising, before step a:

a₁judging whether the fuel cell is started;

if the fuel cell needs to be started, sending an initial power requirement to the fuel cell to enable the fuel cell to work at the initial power, and turning to the step a, wherein the initial power forms constant power;

and if the fuel cell does not need to be started, keeping the fuel cell stopped.

3. The dynamic response control method of the fuel cell according to claim 2, wherein step 3) in step c specifically includes:

sending a second change request to the fuel cell to change the output power of the fuel cell to the target output power P₂After being held constant and before going to step a, the method comprises the following steps:

d, judging whether the fuel cell stops working or not;

if the work does not need to be stopped, turning to the step a;

and if the operation needs to be stopped, stopping the fuel cell.

4. The dynamic response control method of the fuel cell according to claim 1, wherein step 2) in step c specifically includes:

after determining the target output power of the fuel cell which needs to be changed, a first preset time t passes₁Then sending the first power change request to the fuel cell;

the step 3) in the step c specifically comprises the following steps:

at the output power of the fuel cell being greater than or equal to P₁- Δ P and less than or equal to P₁Changes and maintains the second preset time t within the range of + delta P₂And then, sending the second change demand to the fuel cell.

5. The dynamic response control method of a fuel cell according to claim 1, characterized in that the power change amount Δ P is determined according to a current vehicle speed state of the vehicle at the time of executing step 2) in step c.

6. The dynamic response control method of a fuel cell according to claim 1, characterized in that the power variation amount Δ P is ≦ 5 kw.

7. The dynamic response control method of a fuel cell according to claim 6, characterized in that the power variation amount Δ P is less than or equal to 3 kw.

Technical Field

The invention relates to the technical field of pure electric vehicles, in particular to a dynamic response control method of a fuel cell.

Background

The fuel cell vehicle is currently entering a commercial application stage as a new product, and due to its own characteristics, the fuel cell vehicle is used as a power generation system to provide energy for the entire vehicle or charge a power battery when the vehicle starts, but due to its own characteristics, the fuel cell in the current fuel cell vehicle has a long time to respond to the required power, so how to increase the response speed of the fuel cell to the required power is an urgent problem to be solved at present.

Disclosure of Invention

The invention discloses a dynamic response control method of a fuel cell, in the dynamic response control method of the fuel cell, before the output power of the fuel cell is changed to the target output power, the upper and lower dynamic responses are firstly carried out near the original power, the service life of the fuel cell can be effectively prolonged, and when the fuel cell required by a VCU is changed to the next gear, namely, the target power, the fuel cell can more quickly correspond to the required power of the VCU, and the response speed of the fuel cell is improved.

In order to achieve the purpose, the invention provides the following technical scheme:

a dynamic response control method of a fuel cell, comprising:

a. acquiring the current output power P of a fuel cell in a mode that the fuel cell operates at constant power₁Acquiring the current SOC of the power battery;

b. judging whether the output power of the fuel cell needs to be changed or not according to the acquired current power cell SOC;

c. determining a control mode of the fuel cell according to the judgment result;

if the output power of the fuel cell needs to be changed:

1) determining the target output power P of the fuel cell after the fuel cell needs to be changed according to the obtained current power cell SOC₂；

2) Sending a first power change request to the fuel cell to make the output power of the fuel cell be greater than or equal to P₁- Δ P and less than or equal to P₁Within the range of + Δ P so that the output power of the fuel cell is changed at the present output power P₁Where Δ P is the amount of power change, and P is the amount of power change₁Is not less than Δ P, and | - [ P ]₂-P₁∣＞ΔP；

3) And sending a second change request to the fuel cell to change the output power of the fuel cell to the target output power P₂Keeping the constant, and turning to the step a;

and if the output power of the fuel cell does not need to be changed, continuing to operate at the current constant power, and turning to the step a.

According to the dynamic response control method of the fuel cell, before the output power of the fuel cell is changed to the target output power, the output power of the fuel cell is dynamically and vertically corresponding to the original power, the service life of the fuel cell can be effectively prolonged, and when the fuel cell required by the VCU is changed to the next gear, namely, the target power, the fuel cell can quickly correspond to the required power of the VCU, so that the response speed of the fuel cell is improved.

Optionally, before step a, the method further comprises:

a₁judging whether the fuel cell is started;

if the fuel cell needs to be started, sending an initial power requirement to the fuel cell to enable the fuel cell to work at the initial power, and turning to the step a, wherein the initial power forms constant power;

and if the fuel cell does not need to be started, keeping the fuel cell stopped.

Optionally, step 3) in step c specifically includes:

sending a second change request to the fuel cell to change the output power of the fuel cell to the target output power P₂After being held constant and before going to step a, the method comprises the following steps:

d, judging whether the fuel cell stops working or not;

if the work does not need to be stopped, turning to the step a;

and if the operation needs to be stopped, stopping the fuel cell.

Optionally, step 2) in step c specifically includes:

after determining the target output power of the fuel cell which needs to be changed, a first preset time t passes₁Then sending the first power change request to the fuel cell;

the step 3) in the step c specifically comprises the following steps:

at the output power of the fuel cell being greater than or equal to P₁- Δ P and less than or equal to P₁Within the range of + Δ PChanging and maintaining the second preset time t₂And then, sending the second change demand to the fuel cell.

Alternatively, the power variation Δ P is determined according to a current vehicle speed state of the vehicle at the time of executing step 2) in the step c).

Optionally, the power variation Δ P ≦ 5 kw.

Optionally, the power variation Δ P ≦ 3 kw.

Drawings

Fig. 1 is a flowchart of a dynamic response control method for a fuel cell according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The dynamic response control method of the fuel cell provided by the embodiment is based on a fuel cell vehicle, wherein the fuel cell vehicle comprises a vehicle control unit VCU (integrated with power control of the fuel cell inside the VCU), a fuel cell controller FCU, a power cell manager BMS, the fuel cell, the power cell and a DCDC, the vehicle control unit VCU is connected with the fuel cell controller FCU and the power cell manager BMS through a CAN network, the fuel cell controller FCU is connected with the fuel cell, and the power cell manager BMS is connected with the power cell; the starting, stopping and power decision of the fuel cell are controlled by a VCU (vehicle control unit), and then the fuel cell is controlled by interaction between the CAN communication and a FCU (fuel cell controller unit).

The embodiment of the invention manages the starting, stopping and target power calculation of the fuel cell by a reasonable control method based on the original control flow of the fuel cell vehicle, reasonably controls the power change of the fuel cell by combining the running state of the vehicle, the SOC of the power cell and other factors, enables the fuel cell to respond to the required power of the VCU more quickly on the premise of ensuring the service life of the fuel cell, and meets the requirement of the dynamic property of the whole vehicle.

Specifically, the present invention is described in the following embodiments, and it should be noted that the control methods in the following embodiments are all implemented based on a fuel cell vehicle, and the following control methods can be implemented by a control system in the fuel cell vehicle. Specifically, as shown in fig. 1, an embodiment of the present invention provides a dynamic response control method for a fuel cell, including:

firstly, step a is executed, and the current output power P of the fuel cell is obtained under the mode that the fuel cell works at constant power₁Acquiring the current SOC of the power battery;

then, step b is executed, and whether the output power of the fuel cell needs to be changed or not is judged according to the current power cell SOC obtained in the step a;

then, executing step c, and determining the control mode of the fuel cell according to the judgment result in step b;

wherein, if the output power of the fuel cell needs to be changed:

firstly, step 1) is executed, and the target output power P after the fuel cell needs to be changed is determined according to the obtained current power cell SOC₂；

Then step 2) is executed, the target output power P after the fuel cell is determined to need to be changed₂Thereafter, the first preset time t may be waited for₁Thereafter, i.e. after a certain period of time t₁Then, a first power change request is sent to the fuel cell so that the output power of the fuel cell is greater than or equal to P₁- Δ P and less than or equal to P₁Continuously changes within the range of + delta P to make the output power of the fuel cell at the current output power P₁Where Δ P is the power change amount, Δ P is a positive value, and P is a positive value₁Is not less than Δ P, and | - [ P ]₂-P₁| is > Δ P; specifically, the output power of the fuel cell is set at P₁- Δ P and P₁The continuous change between + Δ P may be in turn to the fuel cellTransmitting a plurality of power change commands, wherein the temporary target power P in each power change command can be P₁+ΔP₁Or P₁-ΔP₁Wherein, Δ P₁Is a positive value, Δ P₁Is a value less than or equal to Δ P, i.e. the temporary target power P is a ratio of the target output power P₂Small but at the output power P₁A power value fluctuating up and down in the vicinity of the power value to maintain the output power of the fuel cell at the temporary target power P for a second preset time t₂I.e. the output power of the fuel cell is at P₁Dynamically responding in a small range of the upper and lower parts of the vicinity, and passing time t₂Then, the next step is carried out;

finally, 3) is executed, and in addition to the temporary target power P being the output power of the fuel cell, a second power change request is transmitted to the fuel cell to change the output power of the fuel cell to the target output power P₂Keeping the constant, turning to the step a, and sequentially reciprocating the steps to adjust the output power of the fuel cell;

and if the output power of the fuel cell does not need to be changed, continuing to work at the current constant power, turning to the step a, and sequentially repeating the steps to adjust the output power of the fuel cell.

Therefore, in the above-mentioned method for controlling dynamic response of fuel cell, before the output power of fuel cell is changed to the target output power, the output power of fuel cell is dynamically and vertically corresponded to the original power, so as to effectively prolong the service life of fuel cell, and when the fuel cell required by VCU is changed to the next gear, that is, to the target power, the fuel cell can more quickly correspond to the required power of VCU, so as to improve the response speed of fuel cell.

Specifically, the above method for controlling a dynamic response of a fuel cell further comprises, before step a:

step a₁Judging whether to start the fuel cell after starting the vehicle;

if the fuel cell needs to be started, sending an initial power requirement to the fuel cell to enable the fuel cell to work at the initial power, turning to the step a, and sequentially carrying out subsequent steps to adjust the output power of the fuel cell, wherein the initial power forms constant power;

and if the fuel cell does not need to be started, keeping the fuel cell stopped.

Specifically, in the above method for controlling a dynamic response of a fuel cell, step 3) in step c specifically includes:

sending a second change request to the fuel cell to change the output power of the fuel cell to the target output power P₂After being held constant and before going to step a, the method comprises the following steps:

d, judging whether the fuel cell stops working or not;

if the operation does not need to be stopped, turning to the step a, and sequentially carrying out subsequent steps to adjust the output power of the fuel cell;

if it is necessary to stop the operation, the fuel cell is stopped.

The above judgment of whether the fuel cell needs to be shut down is carried out, the judgment can be carried out according to the factors including the power cell SOC obtained in real time, the fuel cell is reasonably controlled to be shut down, the protection of the fuel cell and the power cell can be facilitated, and the power of the fuel cell is reasonably distributed.

Specifically, for step 2) in step c):

after determining the target output power of the fuel cell which needs to be changed, a first preset time t passes₁Then sending a first power change demand to the fuel cell, wherein the first preset time t₁Can be set according to the SOC of the power battery monitored in real time and the first preset time t₁May be in a range of 10s to 15s for a second predetermined time t₂The time may be 10s, 12s, or 13s, or may be other values, which is not limited in this embodiment;

for step 3) in step c):

at a fuel cell output of greater than or equal to P₁- Δ P and less than or equal to P₁Changes and maintains the second preset time t within the range of + delta P₂Then, electricity is supplied to the fuelThe pool sends a second change demand for a second preset time t₂Can be set according to the SOC of the power battery monitored in real time and the second preset time t₂May range from 10s to 30s, e.g. a second predetermined time t₂The time may be 10s, 12s, 15s or 20s, or may be other values, and the embodiment is not limited.

Specifically, the power variation amount Δ P is determined according to the current vehicle speed state of the vehicle at the time of executing step 2) in step c; specifically, the power variation amount Δ P is less than or equal to 5kw, and more specifically, the power variation amount Δ P is less than or equal to 3kw such that the fuel cell outputs the power P at the time of the temporary target power with respect to the current output power₁The variation range of the up-down fluctuation is small, which is beneficial to prolonging the service life of the fuel cell, for example, the power variation Δ P may be 1kw, 1.2kw, 2kw or 2.5kw, or other values, and the embodiment is not limited.

It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.