CN108790848A - A kind of fuel-cell vehicle uphill starting control system, method and vehicle - Google Patents

Abstract

The invention discloses a fuel cell vehicle hill start control system, method and vehicle, which are applied to fuel cell extended-range vehicles. The invention adds an energy storage device to the fuel cell vehicle hill start control system in the prior art, It also provides a third relay to control whether the energy storage device provides energy for the fuel cell vehicle. The energy storage device can store the energy recovered from part of the energy. When the SOC of the power battery is high, the third relay is disconnected, and the power battery and the fuel cell to provide energy for the fuel cell vehicle to climb; when the power battery SOC is low, the third relay of the energy storage device is closed, and the power battery, fuel cell and energy storage device jointly provide energy for the fuel cell vehicle to climb.

Description

A fuel cell vehicle hill start control system, method and vehicle

technical field

The invention relates to the technical field of complete vehicle control of new energy fuel cell vehicles, in particular to a fuel cell vehicle hill start control system, method and vehicle.

Background technique

As a new product, fuel cell vehicles are entering the stage of commercial application in the world, and are still in the stage of simulation testing and demonstration verification in my country. Since fuel cell vehicles are just emerging, there is currently no solution for ramp-starting such vehicles. The technical roadmap for fuel cell extended-range vehicles is shown in Figure 1. When the vehicle controller 103 drives the driving motor 104 to climb a slope, when the SOC (State of Charge, also called the remaining power) of the power battery 102 is relatively high When the SOC of the power battery 102 is not high (such as <85%), the relays S1 and S2 are closed, and the fuel cell 101 Provide energy with the power battery 102 at the same time, and the recovered energy charges the power battery 102; when the SOC of the power battery 102 is low (such as <10%), the power battery 102 cannot provide enough energy for the vehicle to climb a slope, and at the same time close the relay S1 , S2, can be connected to the fuel cell 101, relying on fuel cell power generation to provide energy for vehicle climbing, but due to the slow response capability of the fuel cell to load demand, it affects the performance of fuel cell vehicle climbing.

Contents of the invention

In view of the above problems, the present invention proposes a fuel cell vehicle hill start control system, method and vehicle to overcome the above problems, so as to ensure that the fuel cell vehicle can climb normally when starting on a hill, and improve the climbing performance of the fuel cell vehicle.

To achieve the above object, the present invention provides the following technical solutions:

A hill start control system for a fuel cell vehicle, applied to a fuel cell extended-range vehicle, the system includes: a fuel cell, a power battery, a first relay, and a second relay, and the power battery communicates with the entire vehicle through the first relay The fuel cell is connected to the vehicle controller through the second relay. The system also includes: an energy storage device and a third relay, and the energy storage device is connected to the vehicle controller through the third relay. The vehicle controller is connected;

The vehicle controller controls the opening and closing of the third relay according to the state of charge SOC of the power battery, and controls the energy storage device to provide energy for the fuel cell vehicle to drive the drive motor for the A fuel cell vehicle performs hill climbing.

Further, the vehicle controller controls the opening and closing of the third relay according to the state of charge SOC of the power battery, and controls the energy storage device to provide energy for the fuel cell vehicle to drive the drive motor, so as to For the fuel cell vehicle to climb, including:

When the SOC of the power battery is greater than the first preset value, the third relay is controlled to be closed, and the recovered energy is stored in the energy storage device;

When the SOC of the power battery is less than the first preset value, the third relay is controlled to be turned off, and the recovered energy is used to charge the power battery, and the power battery and the fuel The batteries jointly provide energy for the fuel cell vehicle to climb hills;

When the SOC of the power battery is less than the second preset value, the third relay is controlled to close, and the power battery, the fuel cell and the energy storage device jointly provide energy for the fuel cell vehicle to perform climbing.

Further, the energy storage device is a supercapacitor, a lead-acid storage battery, a nickel-cadmium storage battery, a nickel-hydrogen storage battery or a lithium-ion storage battery.

The present invention also discloses a fuel cell vehicle hill start control method, which is applied to the fuel cell vehicle hill start control system, and the method includes:

Obtain the current speed of the fuel cell vehicle, the current motor speed, the slope value of the slope sensor and the current SOC of the power battery;

Monitor the current throttle status;

Control the opening and closing of the third relay according to the current vehicle speed, the current motor speed, the gradient value of the gradient sensor, the current SOC of the power battery and the current accelerator pedal, and control the energy storage device to The fuel cell vehicle provides energy to drive the drive motor for climbing the fuel cell vehicle.

Further, the opening and closing of the third relay is controlled according to the current vehicle speed, the current motor speed, the slope value of the slope sensor, the current SOC of the power battery, and the current accelerator pedal. The energy storage device provides energy for the fuel cell vehicle to drive the drive motor for climbing the fuel cell vehicle, including:

Judging the relationship between the SOC of the current power battery and a preset value;

When the SOC of the current power battery is greater than the preset value, control the third relay to turn off;

When the current SOC of the power battery is less than the preset value, it is judged whether the current throttle state is greater than the throttle set value;

If the current throttle state is greater than the throttle set value, it is judged whether the current motor speed is smaller than the motor speed set value;

If the current motor speed is less than the set value of the motor speed, control the third relay to close;

If the current motor speed is greater than the set value of the motor speed, control the third relay to be disconnected;

If the current throttle state is less than the throttle set value, it is judged whether the fuel cell vehicle is on a slope or parked on a slope;

If the fuel cell vehicle is on a slope or parked on a slope, control the third relay to be turned off;

If the fuel cell vehicle is not on a slope or parked on a slope, the third relay is controlled to be closed.

Further, when the third relay is controlled to be turned off, the power battery and the fuel cell are controlled to jointly provide energy for the fuel cell vehicle to climb, and the recovered energy is used as the power battery to charge.

Further, when the third relay is controlled to be closed, it is judged whether the fuel cell vehicle is in the energy recovery mode, and when the fuel cell vehicle is in the energy recovery mode, the recovered energy is stored in the energy storage device.

Further, the judging whether the fuel cell vehicle is in the energy recovery mode includes:

judging the relationship between the current SOC of the power battery and a first preset value;

If the current SOC of the power battery is greater than the first preset value, it is determined that the fuel cell vehicle is in an energy recovery mode.

The present invention also discloses a vehicle, comprising: the fuel cell vehicle hill start control system described above.

It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a fuel cell vehicle hill start control system, method and vehicle, which are applied to fuel cell extended-range vehicles. The system includes: fuel cells, power The battery, the first relay, and the second relay. The power battery is connected to the vehicle controller through the first relay, and the fuel cell is connected to the vehicle controller through the second relay. The system also includes: an energy storage device and a third relay. The energy device is connected to the vehicle controller through the third relay; the vehicle controller controls the opening and closing of the third relay according to the state of charge SOC of the power battery, and controls the energy storage device to provide energy for the fuel cell vehicle to drive the drive motor , for fuel cell vehicles to climb hills. The present invention adds an energy storage device to the fuel cell vehicle hill start control system in the prior art, and provides a third relay to control whether the energy storage device provides energy for the fuel cell vehicle, and the energy storage device can recover part of the energy When the SOC of the power battery is high, the third relay is disconnected, and the power battery and the fuel cell provide energy for the fuel cell vehicle to climb; when the SOC of the power battery is low, the third relay of the energy storage device is closed, Power batteries, fuel cells and energy storage devices jointly provide energy for fuel cell vehicles to climb hills.

The above description is only an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable , the specific embodiments of the present invention are enumerated below.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

FIG. 1 is a schematic structural diagram of a fuel cell vehicle hill start control system provided in the prior art;

Fig. 2 is a schematic structural diagram of a hill start control system for a fuel cell vehicle provided by an embodiment of the present invention;

Fig. 3 is a schematic flowchart of a fuel cell vehicle hill start control method provided by an embodiment of the present invention;

FIG. 4 is a specific schematic flowchart of an implementation manner of step 303 provided by the embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

As shown in Fig. 2, the embodiment of the present invention provides a hill start control system for a fuel cell vehicle, which is applied to a fuel cell extended-range vehicle. The system includes: a fuel cell 201, a power battery 202, a first relay S1, a second Relay S3, the power battery 202 is connected to the vehicle controller 203 through the first relay S1, and the fuel cell 201 is connected to the vehicle controller 203 through the second relay S2. On the original basis, the system also includes: an energy storage device 204 and The third relay S3, the energy storage device 204 is connected with the vehicle controller 203 through the third relay S3; the vehicle controller 203 controls the opening and closing of the third relay S3 according to the SOC of the power battery 202, and the energy storage The device 204 provides energy for the fuel cell vehicle to drive the drive motor 205 for climbing the fuel cell vehicle.

Further, the vehicle controller 203 controls the opening and closing of the third relay S3 according to the state of charge SOC of the power battery 202, and the energy storage device 204 provides energy for the fuel cell vehicle to drive the drive motor 205 for the fuel cell The vehicle climbs the slope, specifically:

When the SOC of the power battery is greater than the first preset value, the third relay is controlled to be closed, and the recovered energy is stored in the energy storage device; when the SOC of the power battery is lower than the first preset value, the third relay is controlled to be disconnected, The recovered energy is charged for the power battery, and the power battery and the fuel cell jointly provide energy for the fuel cell vehicle to climb; when the SOC of the power battery is less than the second preset value, the third relay is controlled to close, and the power Batteries, fuel cells and energy storage devices work together to provide energy for fuel cell vehicles to climb hills.

Further, the energy storage device is a supercapacitor, a lead-acid storage battery, a nickel-cadmium storage battery, a nickel-hydrogen storage battery or a lithium-ion storage battery.

It should be noted that the first preset value mentioned above can be calibrated to 85% when the SOC of the power battery is relatively high. Specifically, when the SOC of the power battery is not in a particularly high range (such as <85%, it can be Calibration), the relay S3 of the energy storage device is disconnected, at this time, the energy recovered from the energy is used to charge the power battery; Part of the energy is charged to the energy storage device, and the energy storage device stores the energy for use when the vehicle has a low SOC and climbs a slope.

When the fuel cell vehicle is parked on a slope for a long time and the SOC of the power battery is lower than the set value (such as <10%, it can be calibrated), or it happens that the SOC of the power battery is not enough to provide enough energy for the whole vehicle to climb the slope. , the vehicle controller detects that the vehicle is on the slope through the slope sensor, and recognizes the accelerator, motor speed, vehicle speed and other signals, and determines through analysis that the driver intends to climb the slope. At this time, the vehicle controller controls the third relay S3 Closed, let the energy storage device, fuel cell and power battery jointly provide energy for the vehicle, so that the fuel cell vehicle can climb smoothly; when the SOC of the power battery is not lower than the set value (10%), the power battery has sufficient discharge capacity at this time , the power battery and the fuel cell jointly provide the vehicle with energy without the energy storage device, and the vehicle controller controls the third relay S3 to turn off; Open the third relay S3; when encountering a small slope, judge whether the vehicle can pass smoothly by monitoring the motor speed and other signals, and whether it is necessary to close the third relay S3, and the energy storage device provides energy.

The fuel cell vehicle hill start control system provided by the embodiment of the present invention adds an energy storage device to the prior art fuel cell vehicle hill start control system, and provides a third relay to control whether the energy storage device is a fuel cell vehicle To provide energy, the energy storage device can store the energy recovered from part of the energy. When the SOC of the power battery is high, the third relay is disconnected, and the power battery and the fuel cell provide energy for the fuel cell vehicle to climb; when the power battery When the SOC is low, the third relay of the energy storage device is closed, and the power battery, the fuel cell and the energy storage device jointly provide energy for the fuel cell vehicle to climb.

Based on the same inventive concept, the embodiments of the present invention also provide a fuel cell vehicle hill start control method and the vehicle, such as the following embodiments. Since the fuel cell vehicle hill start control method and vehicle problem-solving principle are similar to the fuel cell vehicle hill start control system, the fuel cell vehicle hill start control method and vehicle implementation can be found in fuel cell vehicle hill start control The implementation of the system will not be repeated here.

As shown in FIG. 3 , an embodiment of the present invention provides a fuel cell vehicle hill start control method, which is applied to the above fuel cell vehicle hill start control system. The method specifically includes the following steps:

S301. Obtain the current vehicle speed of the fuel cell vehicle, the current motor speed, the slope value of the slope sensor, and the current SOC of the power battery;

S302. Monitoring the current accelerator state;

S303. Control the opening and closing of the third relay according to the current vehicle speed, the current motor speed, the slope value of the slope sensor, the current SOC of the power battery, and the current accelerator pedal, and control the energy storage device to provide energy for the fuel cell vehicle to drive the motor. Driven for fuel cell vehicles to climb hills.

As shown in Figure 4, it is a specific process of an implementation of step 303, and the disconnection of the third relay is controlled according to the current vehicle speed, the current motor speed, the slope value of the slope sensor, the current SOC of the power battery, and the current accelerator pedal. and closed, the energy storage device provides energy for the fuel cell vehicle to drive the drive motor for the fuel cell vehicle to climb, which may specifically include the following:

S401. Determine whether the current SOC of the power battery is smaller than a preset value, if yes, perform step S402; if not, perform step S406.

S402 , judging whether the current throttle state is greater than the throttle set value, if yes, execute step S403 , if not, execute step S405 .

S403 , judging whether the current motor speed is lower than the set value of the motor speed, if yes, execute step S404 ; if not, execute step S406 .

S404. Control the third relay to close.

S405. Determine whether the fuel cell vehicle is on a slope or parked on a slope. If yes, execute step S406; if not, execute step S403.

S406. Control the third relay to turn off.

It should be noted that when the fuel cell vehicle is parked on a slope for a long time, the SOC of the power battery is lower than the preset value (such as <10%, which can be calibrated), or the SOC of the power battery is not enough to be full when climbing a slope. When the car climbs a slope with sufficient capability, the vehicle controller detects that the vehicle is on the slope through the slope sensor, and recognizes the accelerator, motor speed, and vehicle speed signals, and obtains the driver's intention to climb the slope through analysis. At this time, the vehicle controller controls the third relay S3 to close, so that the energy storage device, the fuel cell and the power battery can jointly provide energy for the vehicle, so that the vehicle can climb smoothly. When the SOC of the power battery is not lower than the preset value, the power battery has sufficient discharge capacity at this time, and the power battery and the fuel cell jointly provide the capacity for the vehicle without the energy storage device providing capacity, and the vehicle controller controls the third relay S3 Disconnect; when the vehicle climbs a slope smoothly or when the vehicle is parked on a slope, disconnect the energy storage device relay S3; when encountering a small slope, judge whether the vehicle can pass smoothly by monitoring the motor speed and other signals, and whether it needs to be closed Energy storage device relay S3.

Further, when the third relay is controlled to be turned off, the power battery and the fuel cell jointly provide energy for the fuel cell vehicle to climb, and the recovered energy is used to charge the power battery.

Further, when the third relay is controlled to be closed, it is determined whether the fuel cell vehicle is in the energy recovery mode, and when the fuel cell vehicle is in the energy recovery mode, the recovered energy is stored in the energy storage device.

Further, judging whether the fuel cell vehicle is in the energy recovery mode includes:

judging the relationship between the current SOC of the power battery and the first preset value;

If the current SOC of the power battery is greater than the first preset value, it is determined that the fuel cell vehicle is in the energy recovery mode.

The embodiment of the present invention also discloses a vehicle, including: the above-mentioned fuel cell vehicle hill start control system.

The fuel cell vehicle hill start control method and the vehicle provided by the embodiments of the present invention add an energy storage device to the fuel cell vehicle hill start control system in the prior art, and provide a third relay to control whether the energy storage device is a fuel cell vehicle. The battery vehicle provides energy, and the energy storage device can store part of the energy recovered from the energy. When the SOC of the power battery is high, the third relay is disconnected, and the power battery and fuel cell provide energy for the fuel cell vehicle to climb; When the SOC of the power battery is low, the third relay of the energy storage device is closed, and the power battery, the fuel cell and the energy storage device jointly provide energy for the fuel cell vehicle to climb.

The fuel cell vehicle hill start control system, method and vehicle provided by the embodiments of the present invention can solve the following problems:

When the SOC of the vehicle power battery is high, the braking energy is recovered during the period and stored, which fully improves the energy utilization rate and effectively avoids energy waste;

Use the slope sensor, power battery SOC, accelerator, motor speed and other signals to judge whether the vehicle is closed when the third relay is started on a slope to use the energy storage device to provide energy for the vehicle to climb, effectively solving the problem of the fuel cell responding slowly to the load demand problem, thereby improving the climbing performance of the vehicle.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. any such actual relationship or order exists between them. Moreover, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that an article or device comprising a set of elements includes not only those elements but also other elements not expressly listed, Or also include elements inherent in the article or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in an article or device comprising the aforementioned element.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (9)

1. a kind of fuel-cell vehicle uphill starting control system, is applied to fuel cell extended-range vehicle, which includes：Combustion Expect that battery, power battery, the first relay, the second relay, the power battery pass through first relay and vehicle control Device processed is connected, and the fuel cell is connected by second relay with the entire car controller, which is characterized in that the system Further include：Energy storage device and third relay, the energy storage device pass through the third relay and the entire car controller phase Even；

The entire car controller controls the disconnected open and close of the third relay according to the state-of-charge SOC of the power battery It closes, controls the energy storage device and provide energy for fuel-cell vehicle driving motor is driven, for the fuel cell Vehicle is climbed.

2. system according to claim 1, which is characterized in that the entire car controller is charged according to the power battery State SOC controls disconnection and the closure of the third relay, controls the energy storage device and provides energy for fuel-cell vehicle Driving motor is driven, so that the fuel-cell vehicle is climbed, including：

When the SOC of the power battery is more than the first preset value, controls the third relay and be closed, the energy that recycling is obtained Amount is stored in the energy storage device；

When the SOC of the power battery is less than first preset value, controls the third relay and disconnect, by the recycling Obtained energy be the power battery charge, by the power battery and the fuel cell provide jointly energy for The fuel-cell vehicle is climbed；

When the SOC of the power battery is less than the second preset value, controls the third relay and be closed, by the power electric Pond, the fuel cell and the energy storage device provide energy so that the fuel-cell vehicle is climbed jointly.

3. system according to claim 1 or 2, which is characterized in that the energy storage device is super capacitor, lead acid storage battery Pond, nickel-cadmium accumulator, nickel-hydrogen dattery or lithium-ions battery.

4. a kind of fuel-cell vehicle uphill starting period control method, which is characterized in that be applied to claim 1-3 any one The fuel-cell vehicle uphill starting control system, this method include：

Obtain current vehicle speed, current motor rotating speed, the value of slope of Slope Transducer and the current power electricity of fuel-cell vehicle The SOC in pond；

Monitor current throttle state；

According to the current vehicle speed, the current motor rotating speed, the value of slope of the Slope Transducer, the current power battery SOC and current throttle hit him and control disconnection and the closure of the third relay, control energy storage device is fuel electricity Pond vehicle provides energy and is driven to driving motor, so that the fuel-cell vehicle is climbed.

5. according to the method described in claim 4, it is characterized in that, described turn according to the current vehicle speed, the current motor The value of slope of fast, the described Slope Transducer, the SOC of the current power battery and current throttle hit he control the third after The disconnection of electric appliance and closure, control energy storage device provide energy for the fuel-cell vehicle and are driven to driving motor, with Climb for the fuel-cell vehicle, including：

Judge the relationship of the SOC and preset value of the current power battery；

When the SOC of the current power battery is more than the preset value, controls the third relay and disconnect；

When the SOC of the current power battery is less than the preset value, judge whether the current throttle state is more than throttle Setting value；

If the current throttle state is more than the throttle setting value, judge whether the current motor rotating speed is less than motor speed Setting value；

If current motor rotating speed is less than the motor speed setting value, controls the third relay and be closed；

If current motor rotating speed is more than the motor speed setting value, controls the third relay and disconnect；

If the current throttle state is less than the throttle setting value, judge the fuel-cell vehicle whether on the ramp or Ramp parking；

If the fuel-cell vehicle is on ramp or ramp parking, controls the third relay and disconnect；

If the fuel-cell vehicle is not on ramp or ramp parking, controls the third relay and be closed.

6. according to the method described in claim 5, it is characterized in that, when controlling the third relay and disconnecting, described in control Power battery and the fuel cell provide energy so that the fuel-cell vehicle is climbed jointly, and the recycling is obtained Energy be the power battery charge.

7. according to the method described in claim 5, it is characterized in that, when controlling the third relay and being closed, described in judgement Whether fuel-cell vehicle will recycle in energy recuperation mode when fuel-cell vehicle vehicle is in energy recuperation mode Obtained energy storage is in the energy storage device.

8. judging whether the fuel-cell vehicle is in energy the method according to the description of claim 7 is characterized in that described Take-back model, including：

Judge the relationship of the SOC and the first preset value of the current power battery；

If the SOC of the current power battery is more than first preset value, determine that the fuel-cell vehicle is returned in energy Receipts pattern.

9. a kind of vehicle, which is characterized in that including：Fuel-cell vehicle ramp described in the claims 1-3 any one Starting control system.