CN115742883A - Energy recovery power and fuel cell power distribution control system and method - Google Patents
Energy recovery power and fuel cell power distribution control system and method Download PDFInfo
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Abstract
The invention provides an energy recovery power and fuel cell power distribution control system and a method, which belong to the technical field of fuel cell automobiles and comprise a vehicle control unit, a fuel cell controller, a motor controller, a battery management system, an electronic braking system and a vehicle state acquisition module; the vehicle control unit comprises an information receiving module, a power calculating module and a power distributing module; the information receiving module is used for acquiring vehicle condition information; the power calculation module is used for calculating the target power and the energy recovery power of the fuel cell; the power distribution module is used for distributing power, and if needed, the power requested by the fuel cell and the torque of the motor are adjusted. The invention can balance the energy recovery power of the fuel cell automobile and the power of the fuel cell on the premise of ensuring the service life of the power cell, fully recover the energy in the braking and sliding processes and ensure the cruising ability of the fuel cell automobile.
Description
Technical Field
The invention relates to the technical field of fuel cell automobiles, in particular to an energy recovery power and fuel cell power distribution control system and method.
Background
At present, new energy automobiles develop rapidly, and fuel cell automobiles are concerned as a scheme capable of solving the 'mileage anxiety' of the new energy automobiles. The energy recovery is that when the new energy automobile brakes or slides, the generator converts the excess energy released by braking or sliding into electric energy, and stores the electric energy in the battery for later driving, and is an important way for saving energy and increasing cruising ability of the new energy automobile.
Most of research on energy recovery at present focuses on pure electric new energy vehicles, but the recovery mode of the pure electric vehicles cannot be applied to fuel cell vehicles, if the recovery mode of the pure electric vehicles is directly used for the fuel cell vehicles, braking or sliding energy cannot be fully recovered, the duration of the fuel cell vehicles is not facilitated, and the fuel cells and the motors can be charged to the power batteries simultaneously during energy recovery, so that the overcharging of the power batteries can be caused, and the service life of the power batteries can be damaged.
Disclosure of Invention
In view of the deficiencies of the current research situation, the invention provides an energy recovery power and fuel cell power distribution control system and method, which are used for balancing the energy recovery power and the fuel cell power of a fuel cell vehicle and fully recovering the energy in the braking and sliding processes of the fuel cell vehicle.
The invention provides an energy recovery power and fuel cell power distribution control system, which comprises a vehicle control unit, a fuel cell controller, a motor controller, a battery management system, an electronic braking system and a vehicle state acquisition module, wherein the vehicle control unit is used for controlling the vehicle state acquisition module to acquire the vehicle state;
the vehicle control unit is respectively connected with the fuel battery controller, the motor controller, the battery management system, the electronic braking system and the vehicle state acquisition module;
the vehicle control unit comprises an information receiving module, a power calculating module and a power distributing module;
the information receiving module is used for respectively acquiring vehicle condition information from the fuel cell controller, the motor controller, the battery management system, the electronic braking system and the vehicle state acquisition module;
the power calculation module is connected with the information receiving module and used for calculating the target power and the energy recovery power of the fuel cell according to the vehicle condition information acquired by the information receiving module;
the power distribution module is connected with the power calculation module and performs power distribution according to the calculation result of the power calculation module;
the power distribution module is respectively connected with the fuel cell controller and the motor controller, and the power distribution module adjusts the current power of the fuel cell and the torque of the motor by sending control commands to the fuel cell controller and the motor controller.
Preferably, the information receiving module obtains the maximum power of the fuel cell and the current power of the fuel cell through a fuel cell controller;
the information receiving module acquires the motor rotating speed, the motor current and the maximum power of the motor through a motor controller;
the information receiving module acquires the current of the power battery, the current electric quantity of the power battery, the target electric quantity of the power battery and the allowable charging power of the power battery through a battery management system;
the information receiving module acquires brake opening information and an ABS activation signal through an electronic braking system;
the information receiving module acquires vehicle speed information, accelerator opening information, hand brake position information, gear information, vehicle speed information, accessory current and vehicle voltage through the vehicle state acquisition module.
Preferably, the power calculation module comprises an energy recovery power calculation module;
the energy recovery power calculation module is used for judging whether the vehicle can enter an energy recovery mode, and if the accelerator pedal is in a loose state and the ABS signal is not activated, the vehicle enters the energy recovery mode;
after entering the energy recovery mode, the energy recovery power calculation module is used for selecting to enter a braking energy recovery mode or a sliding energy recovery mode according to the vehicle speed information, the gear information, the hand brake position information and the brake opening information;
if the vehicle speed is greater than 2km/h and the brake pedal is in a treading state, the vehicle enters a brake energy recovery mode;
if the vehicle speed is more than 10km/h, the gear is in a forward gear, and the brake pedal and the hand brake are in a released state, the vehicle enters a sliding energy recovery mode;
and if the two conditions are not met, the energy recovery mode is exited.
Preferably, when the vehicle enters the braking energy recovery mode:
the energy recovery power calculation module calculates the braking power required by the vehicle in the current state according to the vehicle braking theory, compares the braking power with the maximum power of the motor and takes a smaller value as the braking energy recovery power;
when the vehicle enters the coasting energy recovery mode:
the energy recovery power calculation module calculates the required sliding power of the vehicle in the current state according to the vehicle sliding theory, and meanwhile, the required sliding power is compared with the maximum power of the motor, and a smaller value is taken as the sliding energy recovery power.
Preferably, the power calculation module further comprises a vehicle energy consumption calculation module and a fuel cell power calculation module;
the whole vehicle energy consumption calculation module is used for performing integral calculation according to the motor current, the power battery current, the accessory current and the whole vehicle voltage to obtain the whole vehicle energy consumption power of the current vehicle;
the fuel cell power calculation module is used for calculating the power compensation power of the power cell according to the current electric quantity of the power cell and the target electric quantity of the power cell, and then calculating the requested power of the fuel cell according to the energy consumption power of the whole vehicle and the power compensation power of the power cell.
Preferably, the power distribution module is configured to perform the steps of:
if the allowable charging power of the power battery is larger than or equal to the sum of the current power and the energy recovery power of the fuel battery, power distribution is not needed;
if the allowable charging power of the power battery is smaller than the sum of the current power of the fuel battery and the energy recovery power, power distribution is required; at the moment, the power distribution module controls the fuel cell controller to reduce the power requested by the fuel cell according to the braking or sliding time, and simultaneously controls the motor controller to increase the energy recovery power, and finally, the sum of the current power and the energy recovery power of the fuel cell is smaller than the allowable charging power of the power cell;
the power distribution module further controls the fuel cell to reduce the current power of the fuel cell to the power requested by the fuel cell through the fuel cell controller, and converts the energy recovery power into torque through the motor controller to control the motor to reversely drag;
the current power of the fuel cell is reduced to the idling power to the minimum extent, so that the fuel cell cannot be closed, and the loss of hydrogen in the starting, stopping and purging processes of the fuel cell is reduced.
The invention also provides an energy recovery power and fuel cell power distribution control method, which comprises the following steps:
step S1: acquiring vehicle condition information;
step S2: calculating target power and energy recovery power of the fuel cell;
and step S3: and performing power distribution according to the relation between the sum of the energy recovery power and the current power of the fuel cell and the allowable charging power of the power battery.
Preferably, in step S1, the vehicle condition information includes a maximum power of the fuel cell, a current power of the fuel cell, a motor speed, a motor current, a maximum power of the motor, a current battery current, a target battery current, an allowable charging power of the power cell, a brake opening degree information, an ABS activation signal, vehicle speed information, an accelerator opening degree information, a hand brake position information, a gear position information, vehicle speed information, an accessory current, and a vehicle voltage.
Preferably, step S2 specifically includes:
step S201: judging whether the vehicle can enter an energy recovery mode or not;
if the accelerator pedal is in a released state and the ABS signal is not activated, the vehicle enters an energy recovery mode;
step S202: judging whether the vehicle enters a braking energy recovery mode or a sliding energy recovery mode;
if the speed of the vehicle is greater than km/h and the brake pedal is in a treading state, the vehicle enters a brake energy recovery mode;
if the vehicle speed is greater than km/h, the gear is in a forward gear, and the brake pedal and the hand brake are in a released state, the vehicle enters a sliding energy recovery mode;
if the two conditions are not met, the energy recovery mode is exited;
step S203: calculating energy recovery power;
when the vehicle enters a braking energy recovery mode, calculating braking energy recovery power:
according to the vehicle braking theory, calculating the braking power required by the vehicle in the current state, comparing the braking power with the maximum power of the motor, and taking a smaller value as the braking energy recovery power;
when the vehicle enters the coasting energy recovery mode, calculating the coasting energy recovery power:
according to the vehicle sliding theory, calculating the sliding power required by the vehicle in the current state, comparing the sliding power with the maximum power of the motor, and taking a smaller value as the sliding energy recovery power;
step S204: calculating a fuel cell requested power;
performing integral calculation according to the motor current, the power battery current, the accessory current and the vehicle voltage to obtain the vehicle energy consumption power of the current vehicle;
calculating the electric quantity compensation power of the power battery according to the current electric quantity of the power battery and the target electric quantity of the power battery;
and calculating the requested power of the fuel cell according to the energy consumption power of the whole vehicle and the electric quantity compensation power of the power cell.
Preferably, the process of power allocation in step S3 is:
if the allowable charging power of the power battery is larger than or equal to the sum of the current power and the energy recovery power of the fuel battery, power distribution is not needed;
if the allowable charging power of the power battery is smaller than the sum of the current power of the fuel battery and the energy recovery power, power distribution is required; reducing the requested power of the fuel cell according to the braking or coasting time, increasing the energy recovery power, and finally enabling the sum of the current power of the fuel cell and the energy recovery power to be smaller than the allowable charging power of the power cell; the fuel cell controller controls the current power of the fuel cell to be reduced to the power requested by the fuel cell, and the motor controller converts the energy recovery power into torque to control the motor to back-drag; the current power of the fuel cell is reduced to the idle power at the minimum, the fuel cell cannot be closed, and the loss of hydrogen in the starting, stopping and purging processes of the fuel cell is reduced.
The invention has the advantages that the invention provides an energy recovery power and fuel cell power distribution control system and a method for a fuel cell vehicle, which can balance the energy recovery power and the fuel cell power of the fuel cell vehicle and fully recover the energy in the braking and sliding processes on the premise of ensuring the service life of a power cell, thereby reducing the energy consumption of the fuel cell vehicle and ensuring the cruising ability of the fuel cell vehicle.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a control system according to the present invention;
FIG. 2 is a schematic structural diagram of the vehicle control unit according to the present invention;
FIG. 3 is a flow chart illustrating a control method according to the present invention;
FIG. 4 is a flowchart illustrating a step S2 of the control method according to the present invention;
labeled as: 1-a vehicle control unit; 2-a fuel cell controller; 3-a motor controller; 4-a battery management system; 5-an electronic braking system; 6-vehicle state acquisition module; 7-a fuel cell; 8, a motor; 9-a power battery; 10-an information receiving module; 11-a power calculation module; 12-a power distribution module; 13-an energy recovery power calculation module; 14, a whole vehicle energy consumption calculation module; 15-fuel cell power calculation module.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the present embodiment, and it is apparent that the embodiments described below are only a part of embodiments of the present invention, and not all 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 scope of protection of this patent.
Example one
As shown in fig. 1 and 2, the present invention provides an energy recovery power and fuel cell power distribution control system, which includes a vehicle controller 1, a fuel cell controller 2, a motor controller 3, a battery management system 4, an electronic braking system 5 and a vehicle state acquisition module 6;
the vehicle control unit 1 is respectively connected with a fuel battery controller 2, a motor controller 3, a battery management system 4, an electronic braking system 5 and a vehicle state acquisition module 6;
the vehicle control unit 1 comprises an information receiving module 10, a power calculating module 11 and a power distributing module 12;
the information receiving module 10 is used for acquiring vehicle condition information;
the information receiving module 10 obtains the maximum power of the fuel cell and the current power of the fuel cell through the fuel cell controller 2;
the information receiving module 10 obtains the motor speed, the motor current and the maximum power of the motor through the motor controller 3;
the information receiving module 10 acquires the current of the power battery, the current electric quantity of the power battery, the target electric quantity of the power battery and the allowable charging power of the power battery through the battery management system 4;
the information receiving module 10 obtains the brake opening information and the ABS activation signal through the electronic braking system 5;
the information receiving module 10 acquires vehicle speed information, accelerator opening information, hand brake position information, gear information, vehicle speed information, accessory current and vehicle voltage through the vehicle state acquisition module 6.
The power calculation module 11 is connected with the information receiving module 10, and the power calculation module 11 calculates the target power of the fuel cell according to the vehicle condition information acquired by the information receiving module 10;
the power calculation module 11 comprises an energy recovery power calculation module 13, a whole vehicle energy consumption calculation module 14 and a fuel cell power calculation module 15;
the energy recovery power calculation module 13 judges whether the vehicle can enter an energy recovery mode, and if the accelerator pedal is in a released state and the ABS signal is not activated, the vehicle enters the energy recovery mode;
after entering the energy recovery mode, the energy recovery power calculation module 13 selects to enter the braking energy recovery mode or the sliding energy recovery mode according to the vehicle speed information, the gear information, the hand brake position information and the brake opening information;
if the speed of the vehicle is more than 2km/h and the brake pedal is in a treading state, the vehicle enters a brake energy recovery mode;
if the vehicle speed is more than 10km/h, the gear is in a forward gear, and the brake pedal and the hand brake are both in a loose state, the vehicle enters a sliding energy recovery mode;
and if the two conditions are not met, the energy recovery mode is exited.
When the vehicle enters a braking energy recovery mode:
the energy recovery power calculation module 13 calculates the braking power required by the vehicle in the current state according to the vehicle braking theory, and compares the braking power with the maximum power of the motor at the same time to obtain a smaller value as the braking energy recovery power;
when the vehicle enters the coasting energy recovery mode:
the energy recovery power calculation module 13 calculates the sliding power required by the vehicle in the current state according to the vehicle sliding theory, and compares the sliding power with the maximum power of the motor at the same time, and takes a smaller value as the sliding energy recovery power.
After the energy recovery power is calculated, the whole vehicle energy consumption calculation module 14 performs integral calculation according to the motor current, the power battery current, the accessory current and the whole vehicle voltage, and calculates the whole vehicle energy consumption power of the current vehicle;
the fuel cell power calculation module 15 calculates the power compensation power of the power cell according to the current electric quantity of the power cell and the target electric quantity of the power cell, and further calculates the requested power of the fuel cell according to the energy consumption power of the whole vehicle and the power compensation power of the power cell.
The power distribution module 12 is connected with the power calculation module 11, and the power distribution module 12 judges to distribute power according to the calculation result of the power calculation module 11;
if the allowable charging power of the power battery is larger than or equal to the sum of the current power and the energy recovery power of the fuel battery, power distribution is not needed;
if the allowable charging power of the power battery is smaller than the sum of the current power of the fuel battery and the energy recovery power, the power battery 9 is continuously charged at the moment, the service life of the power battery 9 is influenced, and power distribution is required;
the power distribution module 12 is respectively connected with the fuel cell controller 2 and the motor controller 3, at this time, the power distribution module 12 controls the fuel cell controller 2 to reduce the requested power of the fuel cell according to the braking or sliding time, and simultaneously controls the motor controller 3 to increase the energy recovery power, and finally, the sum of the current power and the energy recovery power of the fuel cell is smaller than the allowable charging power of the power cell;
the power distribution module 12 further controls the fuel cell 7 to reduce the current power of the fuel cell to the power requested by the fuel cell through the fuel cell controller 2, and converts the energy recovery power into the torque through the motor controller 3 to control the motor 8 to back-drag;
the current power of the fuel cell is reduced to the idling power to the minimum extent, so that the fuel cell cannot be closed, and the loss of hydrogen in the starting, stopping and purging processes of the fuel cell is reduced.
Example two
As shown in fig. 3 and 4, the present invention further provides a method for controlling distribution of energy recovery power and fuel cell power, the method comprising:
step S1: acquiring vehicle condition information;
in step S1, the vehicle condition information includes a maximum power of the fuel cell, a current power of the fuel cell, a motor speed, a motor current, a maximum power of the motor, a current power of the power cell, a target power of the power cell, an allowable charging power of the power cell, brake opening information, an ABS activation signal, vehicle speed information, accelerator opening information, handbrake position information, gear information, vehicle speed information, accessory current, and a vehicle voltage.
Step S2: calculating target power and energy recovery power of the fuel cell;
wherein, step S2 specifically includes:
step S201: judging whether the vehicle can enter an energy recovery mode or not;
if the accelerator pedal is in a released state and the ABS signal is not activated, the vehicle enters an energy recovery mode;
step S202: judging whether the vehicle enters a braking energy recovery mode or a sliding energy recovery mode;
if the vehicle speed is greater than 2km/h and the brake pedal is in a treading state, the vehicle enters a brake energy recovery mode;
if the vehicle speed is more than 10km/h, the gear is in a forward gear, and the brake pedal and the hand brake are both in a loose state, the vehicle enters a sliding energy recovery mode;
if the two conditions are not met, the energy recovery mode is exited;
step S203: calculating energy recovery power;
when the vehicle enters a braking energy recovery mode, calculating the braking energy recovery power:
according to the vehicle braking theory, calculating the braking power required by the vehicle in the current state, comparing the braking power with the maximum power of the motor, and taking a smaller value as the braking energy recovery power;
when the vehicle enters the coasting energy recovery mode, calculating the coasting energy recovery power:
according to the vehicle sliding theory, calculating the sliding power required by the vehicle in the current state, comparing the sliding power with the maximum power of the motor, and taking a smaller value as the sliding energy recovery power;
step S204: calculating a fuel cell requested power;
performing integral calculation according to the motor current, the power battery current, the accessory current and the vehicle voltage to obtain the vehicle energy consumption power of the current vehicle;
calculating the electric quantity compensation power of the power battery according to the current electric quantity of the power battery and the target electric quantity of the power battery;
and calculating the requested power of the fuel cell according to the energy consumption power of the whole vehicle and the electric quantity compensation power of the power cell.
And step S3: performing power distribution according to the relationship between the sum of the energy recovery power and the current power of the fuel cell and the allowable charging power of the power cell;
wherein, the power distribution process in step S3 is as follows:
if the allowable charging power of the power battery is larger than or equal to the sum of the current power and the energy recovery power of the fuel battery, power distribution is not needed;
if the allowable charging power of the power battery is smaller than the sum of the current power and the energy recovery power of the fuel battery, power distribution is needed; reducing the requested power of the fuel cell according to the braking or coasting time, increasing the energy recovery power, and finally enabling the sum of the current power of the fuel cell and the energy recovery power to be smaller than the allowable charging power of the power cell; the fuel cell controller 2 controls the fuel cell 7 to reduce the current power of the fuel cell to the power requested by the fuel cell, and the motor controller 3 converts the energy recovery power into torque to control the motor 8 to drag reversely; the current power of the fuel cell is reduced to the idle power at the minimum, the fuel cell cannot be closed, and the loss of hydrogen in the starting, stopping and purging processes of the fuel cell is reduced.
Claims (10)
1. An energy recovery power and fuel cell power distribution control system is characterized by comprising a vehicle control unit (1), a fuel cell controller (2), a motor controller (3), a battery management system (4), an electronic braking system (5) and a vehicle state acquisition module (6);
the vehicle control unit (1) is respectively connected with the fuel battery controller (2), the motor controller (3), the battery management system (4), the electronic braking system (5) and the vehicle state acquisition module (6);
the vehicle control unit (1) comprises an information receiving module (10), a power calculating module (11) and a power distributing module (12);
the information receiving module (10) is used for respectively acquiring vehicle condition information from the fuel cell controller (2), the motor controller (3), the battery management system (4), the electronic braking system (5) and the vehicle state acquisition module (6);
the power calculation module (11) is connected with the information receiving module (10), and the power calculation module (11) is used for calculating the target power and the energy recovery power of the fuel cell through the vehicle condition information acquired by the information receiving module (10);
the power distribution module (12) is connected with the power calculation module (11), and the power distribution module (12) performs power distribution according to the calculation result of the power calculation module (11);
the power distribution module (12) is respectively connected with the fuel cell controller (2) and the motor controller (3), and the power distribution module (12) adjusts the current power of the fuel cell and the motor torque by sending control commands to the fuel cell controller (2) and the motor controller (3).
2. The energy recovery power and fuel cell power distribution control system according to claim 1, wherein the information receiving module (10) obtains the maximum power of the fuel cell and the current power of the fuel cell through the fuel cell controller (2);
the information receiving module (10) acquires the rotating speed of the motor, the current of the motor and the maximum power of the motor through the motor controller (3);
the information receiving module (10) acquires the current of the power battery, the current electric quantity of the power battery, the target electric quantity of the power battery and the allowable charging power of the power battery through the battery management system (4);
the information receiving module (10) acquires brake opening information and an ABS (anti-lock brake system) activation signal through the electronic brake system (5);
the information receiving module (10) acquires vehicle speed information, accelerator opening information, hand brake position information, gear information, vehicle speed information, accessory current and vehicle voltage through the vehicle state acquisition module (6).
3. The energy recovery power and fuel cell power distribution control system according to claim 1 or 2, characterized in that the power calculation module (11) includes an energy recovery power calculation module (13);
the energy recovery power calculation module (13) is used for judging whether the vehicle can enter an energy recovery mode, and if the accelerator pedal is in a released state and the ABS signal is not activated, the vehicle enters the energy recovery mode;
after the vehicle enters the energy recovery mode, the energy recovery power calculation module (13) is used for selecting to enter a braking energy recovery mode or a sliding energy recovery mode according to the vehicle speed information, the gear information, the hand brake position information and the brake opening information;
if the vehicle speed is greater than 2km/h and the brake pedal is in a treading state, the vehicle enters a brake energy recovery mode;
if the vehicle speed is more than 10km/h, the gear is in a forward gear, and the brake pedal and the hand brake are both in a loose state, the vehicle enters a sliding energy recovery mode;
and if the two conditions are not met, the energy recovery mode is exited.
4. The energy recovery power and fuel cell power distribution control system of claim 3, wherein when the vehicle enters the braking energy recovery mode:
the energy recovery power calculation module (13) calculates the braking power required by the vehicle in the current state according to the vehicle braking theory, compares the braking power with the maximum power of the motor at the same time, and takes a smaller value as the braking energy recovery power;
when the vehicle enters the coasting energy recovery mode:
the energy recovery power calculation module (13) calculates the sliding power required by the vehicle in the current state according to the vehicle sliding theory, and meanwhile, the sliding power is compared with the maximum power of the motor, and the smaller value is taken as the sliding energy recovery power.
5. The energy recovery power and fuel cell power distribution control system of claim 4, wherein the power calculation module (11) further comprises a vehicle energy consumption calculation module (14) and a fuel cell power calculation module (15);
the whole vehicle energy consumption calculation module (14) is used for carrying out integral calculation according to the motor current, the power battery current, the accessory current and the whole vehicle voltage to obtain the whole vehicle energy consumption power of the current vehicle;
the fuel cell power calculation module (15) is used for calculating power cell electric quantity compensation power according to the current electric quantity of the power cell and the target electric quantity of the power cell, and then calculating the fuel cell request power according to the whole vehicle energy consumption power and the power cell electric quantity compensation power.
6. The energy recovery power and fuel cell power distribution control system of claim 1 or 2, wherein the power distribution module (12) is configured to perform the steps of:
if the allowable charging power of the power battery is larger than or equal to the sum of the current power and the energy recovery power of the fuel battery, power distribution is not needed;
if the allowable charging power of the power battery is smaller than the sum of the current power of the fuel battery and the energy recovery power, power distribution is required; at the moment, the power distribution module (12) controls the fuel cell controller (2) to reduce the requested power of the fuel cell according to the braking or sliding time, and simultaneously controls the motor controller (3) to increase the energy recovery power, and finally, the sum of the current power and the energy recovery power of the fuel cell is smaller than the allowable charging power of the power cell;
the power distribution module (12) further controls the fuel cell (7) to reduce the current power of the fuel cell to the power requested by the fuel cell through the fuel cell controller (2), and converts the energy recovery power into torque through the motor controller (3) to control the motor (8) to drag reversely;
the current power of the fuel cell is reduced to the idling power to the minimum extent, so that the fuel cell cannot be closed, and the loss of hydrogen in the starting, stopping and purging processes of the fuel cell is reduced.
7. An energy recovery power and fuel cell power distribution control method, characterized in that the method adopts the energy recovery power and fuel cell power distribution control system according to any one of claims 1 to 6, and the method comprises:
step S1: acquiring vehicle condition information;
step S2: calculating target power and energy recovery power of the fuel cell;
and step S3: and performing power distribution according to the relation between the sum of the energy recovery power and the current power of the fuel cell and the allowable charging power of the power battery.
8. The method according to claim 7, wherein the vehicle condition information in step S1 includes a maximum power of the fuel cell, a current power of the fuel cell, a rotational speed of the motor, a current of the motor, a maximum power of the motor, a current of the power cell, a current electric quantity of the power cell, a target electric quantity of the power cell, an allowable charging power of the power cell, brake opening information, an ABS activation signal, vehicle speed information, accelerator opening information, hand brake position information, gear position information, vehicle speed information, accessory current, and a vehicle voltage.
9. The method according to claim 7, wherein the step S2 specifically comprises:
step S201: judging whether the vehicle can enter an energy recovery mode or not;
if the accelerator pedal is in a released state and the ABS signal is not activated, the vehicle enters an energy recovery mode;
step S202: judging whether the vehicle enters a braking energy recovery mode or a sliding energy recovery mode;
if the speed of the vehicle is more than 2km/h and the brake pedal is in a treading state, the vehicle enters a brake energy recovery mode;
if the vehicle speed is more than 10km/h, the gear is in a forward gear, and the brake pedal and the hand brake are both in a loose state, the vehicle enters a sliding energy recovery mode;
if the two conditions are not met, the energy recovery mode is exited;
step S203: calculating energy recovery power;
when the vehicle enters a braking energy recovery mode, calculating the braking energy recovery power:
according to the vehicle braking theory, calculating the braking power required by the vehicle in the current state, comparing the braking power with the maximum power of the motor, and taking a smaller value as the braking energy recovery power;
when the vehicle enters the coasting energy recovery mode, calculating the coasting energy recovery power:
according to the vehicle sliding theory, calculating the sliding power required by the vehicle in the current state, comparing the sliding power with the maximum power of the motor, and taking a smaller value as the sliding energy recovery power;
step S204: calculating a fuel cell requested power;
performing integral calculation according to the motor current, the power battery current, the accessory current and the vehicle voltage to obtain the vehicle energy consumption power of the current vehicle;
calculating the electric quantity compensation power of the power battery according to the current electric quantity of the power battery and the target electric quantity of the power battery;
and calculating the requested power of the fuel cell according to the energy consumption power of the whole vehicle and the electric quantity compensation power of the power cell.
10. The energy recovery power and fuel cell power distribution control method according to claim 7, wherein the power distribution in step S3 is performed by:
if the allowable charging power of the power battery is larger than or equal to the sum of the current power and the energy recovery power of the fuel battery, power distribution is not needed;
if the allowable charging power of the power battery is smaller than the sum of the current power and the energy recovery power of the fuel battery, power distribution is needed; reducing the requested power of the fuel cell according to the braking or coasting time, increasing the energy recovery power, and finally enabling the sum of the current power of the fuel cell and the energy recovery power to be smaller than the allowable charging power of the power cell; the fuel cell controller (2) controls the fuel cell (7) to reduce the current power of the fuel cell to the power requested by the fuel cell, and the motor controller (3) converts the energy recovery power into torque to control the motor (8) to drag reversely; the current power of the fuel cell is reduced to the idle power at the minimum, the fuel cell cannot be closed, and the loss of hydrogen in the starting, stopping and purging processes of the fuel cell is reduced.
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