KR102338268B1 - The Driving Distance Indication Method of the Fuel Cell Vehicle According to Calculated Remaining Amount of Hydrogen - Google Patents

Abstract

A drivable distance display method according to an embodiment of the present invention,
A vehicle including a fuel cell stack and a hydrogen storage unit, comprising the steps of: turning on the vehicle; measuring the pressure and temperature of at least one hydrogen tank in the hydrogen storage unit to calculate the remaining amount of hydrogen; , comparing the calculated residual amount of hydrogen with the residual amount of hydrogen stored when the vehicle was previously turned off; Outputting the drivable distance of the vehicle according to the remaining amount of hydrogen to the user, and determining whether the vehicle is parked for a long time if the calculated remaining amount of hydrogen is smaller than the remaining amount of hydrogen stored when the vehicle was previously turned off Including, and determining whether the hydrogen storage unit leaks or hydrogen permeation according to whether the vehicle is parked for a long time, and outputs the drivable distance of the vehicle according to the calculated remaining amount of hydrogen to the user.

Description

{The Driving Distance Indication Method of the Fuel Cell Vehicle According to Calculated Remaining Amount of Hydrogen}

The present invention relates to a method of displaying the drivable distance of a fuel cell vehicle, and more particularly, to a method of predicting and displaying the drivable distance of a vehicle based on a residual amount of hydrogen in a hydrogen tank.

A fuel cell vehicle is a type of vehicle that generates propulsion by driving a motor using electric energy produced by reacting hydrogen and oxygen with hydrogen as a fuel and a high voltage battery as a buffer.

A hydrogen storage system including a hydrogen storage tank is necessarily mounted on the hydrogen fuel cell vehicle as described above, and as shown in FIG. 1 , the hydrogen storage tank can be largely divided into four types according to types.

The hydrogen storage tank shown in FIG. 1 ( a ) has an entire tank made of a metal liner, and FIG. 1 ( b ) is a metal liner with a part of the tank body reinforced by using a glass fiber composite material.

In addition, the hydrogen storage tank shown in Fig. 1 (c) is a hydrogen storage tank composed of an aluminum liner and a carbon fiber composite material is used to reinforce the entire tank body, and the hydrogen storage tank shown in Fig. 1 (d) is a non-metal It is configured so that a liner (eg, a high-density plastic liner) is wound using a carbon fiber composite material.

The hydrogen storage tank shown in Fig. 1 (d) has a weight of 60% or more lighter than the hydrogen storage tank shown in Figs. Life and stability can be excellent due to the excellent resilience of the plastic liner during discharge.

Accordingly, there is a trend that a hydrogen storage tank of the type shown in FIG. 1( d ) is mounted in fuel cell vehicles released worldwide, and the drivable distance of the fuel cell vehicle is measured using the hydrogen storage tank shown in FIG. 1 . A system that can be grasped is exemplarily described in Japanese Patent Application Laid-Open No. 3780525.

Japanese Patent Publication No. 3780525

However, in the case of the type shown in FIG. 1(d), the plastic liner is made of a thermoplastic or thermosetting resin material, and the molecular structure of the plastic liner material is larger than the molecular size of hydrogen gas, so that hydrogen flows through the molecular structure of the plastic liner material. There may be a leak problem. Accordingly, a natural fuel reduction due to hydrogen permeation may occur during long-term parking, which may cause anxiety about hydrogen leakage and inconvenience due to shortening of the mileage.

Therefore, the drivable distance display method according to an embodiment of the present invention has been devised to solve the above-described problem, and the drivable distance display method that enables the driver to minimize the anxiety about hydrogen leakage and the discomfort caused by the shortening of the mileage The purpose is to provide a method.

In a vehicle including a fuel cell stack and a hydrogen storage unit, a method for displaying a drivable distance according to an embodiment of the present invention includes the steps of: turning on the ignition of the vehicle; Calculating the remaining amount of hydrogen by measuring the pressure and temperature of the tank, comparing the calculated remaining amount of hydrogen with the remaining amount of hydrogen stored when the vehicle was previously turned off; outputting a drivable distance of the vehicle according to the calculated remaining hydrogen amount to a user when the same as the stored hydrogen remaining amount when the previous ignition is off; Comprising the step of determining whether the vehicle is parked for a long time if it is less than the remaining amount of hydrogen, determining whether the hydrogen storage unit leaks hydrogen or whether hydrogen permeates according to whether the vehicle is parked for a long time, and the vehicle according to the calculated remaining amount of hydrogen It is characterized in that the drivable distance is output to the user.

Preferably, the determining whether the vehicle is parked for a long time may further include receiving information about the parking time of the vehicle.

Preferably, the step of determining whether the vehicle is parked for a long time includes determining that the amount of change in the residual amount of hydrogen in the hydrogen storage unit is due to hydrogen leakage in the hydrogen storage unit when the vehicle is not in a long-term parking state; Outputting the drivable distance of the vehicle according to the remaining amount of hydrogen to a user and diagnosing whether or not hydrogen is leaking from the hydrogen storage unit.

Preferably, the step of determining whether the vehicle is parked for a long time, when the vehicle is in a long-term parking state, further comprising determining a threshold value of a change in the residual amount of hydrogen in the hydrogen storage unit by hydrogen permeation for each parking time of the vehicle characterized in that

Preferably, the determining whether the vehicle is parked for a long time may further include comparing the determined residual hydrogen amount change threshold value with the hydrogen residual amount change amount of the hydrogen storage unit.

Preferably, the step of comparing the determined residual amount of hydrogen change threshold value with the change amount of the residual hydrogen amount of the hydrogen storage unit comprises: When the residual hydrogen amount change threshold value is smaller than the change amount of the residual hydrogen amount, the change amount of the residual hydrogen amount is hydrogen leakage of the hydrogen storage unit and outputting the drivable distance of the vehicle according to the calculated residual amount of hydrogen to the user, and diagnosing whether the hydrogen storage unit is leaking hydrogen.

Preferably, in the step of comparing the determined residual amount of hydrogen change threshold value with the change amount of the residual hydrogen amount of the hydrogen storage unit, when the residual hydrogen amount change threshold value is greater than the change amount of the residual hydrogen amount, the change amount of the residual hydrogen amount of hydrogen permeation of the hydrogen storage unit The method further comprises the steps of converting the change amount of the hydrogen remaining amount into electric energy and comparing the converted electric energy with available electric energy received from a high-voltage battery of the vehicle.

Preferably, the comparing of the converted electric energy with the available electric energy received from the high voltage battery of the vehicle comprises: when the converted electric energy is less than the available electric energy received from the high voltage battery, the previous starting of the vehicle The method may further include maintaining the drivable distance in an off state and outputting the drivable distance to a user.

Preferably, the comparing of the converted electric energy with the available electric energy received from the high-voltage battery of the vehicle comprises: when the converted electric energy is greater than the available electric energy received from the high-voltage battery, the calculated residual amount of hydrogen It characterized in that it further comprises the step of outputting the drivable distance of the vehicle according to the user.

Preferably, the high voltage battery of the vehicle assists the output when the high output of the vehicle is required and stores electrical energy when idle energy is generated.

According to an embodiment of the present invention, the residual amount of hydrogen is calculated by measuring the pressure and temperature of the hydrogen tank after starting. There is an effect of determining whether or not it can be determined as a hydrogen leak and predicting and displaying the drivable distance of the vehicle accordingly.

1 is a view showing a hydrogen storage container by type.
2 is a diagram illustrating a drivable distance display system according to an embodiment of the present invention.
3 is a diagram illustrating a method for displaying a drivable distance according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, it should be noted that in adding reference numerals to the components of each drawing, the same components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, preferred embodiments of the present invention will be described below, but the technical spirit of the present invention is not limited thereto and may be variously implemented by those skilled in the art without being limited thereto.

2 is a diagram illustrating a drivable distance display system 100 according to an embodiment of the present invention.

Referring to FIG. 2 , the drivable distance display system 100 according to an embodiment of the present invention includes a hydrogen storage unit 101 including at least one hydrogen tank 1011 therein, and at least one hydrogen tank. Hydrogen leakage from the control unit 102 measuring the pressure and temperature of 1011 to calculate the remaining amount of hydrogen, the display unit 103 for outputting the drivable distance of the vehicle according to the calculated remaining amount of hydrogen to the user, and the hydrogen storage unit 101 It may include a leak diagnosis unit 104 for diagnosing whether or not.

In this case, the hydrogen storage unit 101 may be exemplarily formed on the rear wheel 10 of the vehicle as shown in FIG. 2 .

At this time, the hydrogen tank 1011 may be a hydrogen storage tank of the type shown in FIG. 1(d), is connected to the fuel cell stack 3, and can supply hydrogen to the fuel cell stack 3 have.

Referring to FIG. 2 , a motor 1 providing power to an engine (not shown) and a reduction gear 2 formed on an output side of the motor 1 may be disposed on the front wheel 9 of the vehicle. In addition, the fuel cell stack 3 may be connected to the motor 1 to provide power to the motor 1 , and the fuel cell stack 3 may be connected to a junction box 4 .

Junction box 4 can be connected with motor 1 and HDC (High-voltage DC/DC Converter, 6), HDC 6 is connected with high-voltage battery 8, and high-voltage battery 8 is connected with LDC (Low-voltage) voltage DC/DC Converter, 5) can be connected. Also, the LDC 5 may be connected to a low voltage battery 7 .

In this case, the HDC may be configured to convert the voltage of the high voltage battery 8 into a voltage for driving the motor 1 , and the LDC 5 may be configured to charge the low voltage battery 7 using the high voltage battery 8 . can be

On the other hand, the high voltage battery 8 may be configured to assist the output when the above-described high output of the vehicle is required and to store electric energy when idle energy is generated.

3 is a diagram illustrating a method for displaying a drivable distance according to an embodiment of the present invention.

Hereinafter, a method for displaying a drivable distance according to an embodiment of the present invention will be described in detail with reference to FIG. 3 .

First, when a user (driver) turns on the ignition of the vehicle (Ignition On, step S1), the control unit 102 of the drivable distance display system 100 controls at least one The pressure and temperature of the hydrogen tank 1011 can be measured (steps S2 and S3), and the residual amount of hydrogen in the hydrogen storage unit 101 can be calculated based on the measured pressure and temperature of the hydrogen tank 1011 (S4). step).

Thereafter, the controller 102 may compare the amount of residual hydrogen calculated when the vehicle is currently started on and the residual amount of hydrogen stored when the vehicle is previously turned off (step S5 ).

If the remaining amount of hydrogen calculated by the control unit 102 is the same as the remaining amount of hydrogen stored when the vehicle was previously turned off, according to the remaining amount of hydrogen calculated by the control unit 102 while the engine is currently on The drivable distance of the vehicle may be output to the user through the display unit 103 of the drivable distance display system 100 (step S7).

In this case, the drivable distance of the vehicle output to the user may be calculated through the controller 102 based on the learned fuel efficiency and the measured fuel efficiency of the engine (not shown) (step S6 ).

On the other hand, when the residual amount of hydrogen calculated through the control unit 102 is smaller than the amount of residual hydrogen stored when the vehicle was previously turned off, it may be determined whether the vehicle is parked for a long time (step S9 ). At this time, if the residual amount of hydrogen calculated by the control unit 102 is measured to be smaller than the amount of residual hydrogen stored when the previous ignition is turned off, it is determined that the hydrogen stored in the hydrogen tank 1011 has leaked or permeated to the outside of the hydrogen tank 1011 . can do.

In addition, the determination of whether the vehicle is parked for a long time may be made by receiving parking time information between a previous starting-off time of the vehicle and a current starting time of the vehicle (step S8 ).

After receiving the parking time information of the vehicle, it can be determined whether the vehicle has been parked for a long time, and when the control unit 102 determines that the vehicle is not in a long-term parking state, as shown in FIG. 3 , the hydrogen storage unit 101 It can be determined that the amount of change in the remaining amount of hydrogen is due to hydrogen leakage from the hydrogen storage unit 101 (step S10).

If the vehicle is not in the long-term parking state, the control unit 102 calculates the drivable distance based on the learned fuel efficiency and the measured fuel efficiency of the engine (step S6), and calculates the drivable distance of the vehicle according to the calculated remaining hydrogen amount. It can be output to the user through the display unit 103 (step S7).

Thereafter, it is possible to diagnose whether hydrogen leaks in the hydrogen storage unit 101 through the leak diagnosis unit 104 of the drivable distance display system 100 .

In addition, in the step of determining whether the vehicle is parked for a long time (step S9), when the control unit 102 determines that the vehicle is in a long-term parking state, hydrogen storage by hydrogen permeation for each parking time of the vehicle through the control unit 102 It is possible to determine a threshold value of the change in the negative residual amount of hydrogen (step S11). At this time, the residual hydrogen amount change threshold value may vary depending on the parking time of the vehicle, and the determined residual hydrogen amount change threshold value is compared with the hydrogen residual amount change amount calculated through the control unit 102 . The residual amount change may be a measure for determining whether the amount of change is due to hydrogen leakage from the hydrogen storage unit 101 or hydrogen permeation.

In addition, through comparison of the residual hydrogen amount change threshold value and the residual hydrogen amount change amount, if the change in the residual hydrogen amount is due to hydrogen leakage, it can be determined that there is a problem in the operation of the hydrogen storage unit 101 , and the change in the residual hydrogen amount is caused by hydrogen permeation If it is, it can be determined that it is a typical reduction in the residual amount of hydrogen according to the parking time of the vehicle.

After determining the threshold value of the change in the residual amount of hydrogen through the controller 102 , the determined threshold value of the change in the residual amount of hydrogen may be compared with the change in the residual amount of hydrogen in the hydrogen storage unit 101 .

If the residual hydrogen amount change threshold value is smaller than the residual hydrogen amount change amount, the controller 102 may determine that the residual hydrogen amount change amount is due to hydrogen leakage from the hydrogen storage unit 101 (step S10 ).

When the residual hydrogen amount change threshold value is smaller than the residual hydrogen amount change amount, the control unit 102 calculates the drivable distance based on the engine learning fuel efficiency and the measured fuel efficiency (step S6), and the vehicle according to the calculated residual hydrogen amount The drivable distance may be output to the user through the display unit 103 (step S7).

Thereafter, it is possible to diagnose whether hydrogen leaks in the hydrogen storage unit 101 through the leak diagnosis unit 104 of the drivable distance display system 100 .

On the other hand, when the residual hydrogen amount change threshold value is greater than the residual hydrogen amount change amount, the controller 102 may determine that the residual hydrogen amount change amount is due to hydrogen permeation of the hydrogen storage unit 101 (step S13 ). At this time, the control unit 102 may convert (calculate) the change amount of the remaining hydrogen amount into electrical energy (step S14).

Thereafter, the converted electrical energy may be compared with the available electrical energy received from the high voltage battery 8 (step S15 ).

If the converted electric energy is smaller than the available electric energy received from the high voltage battery 8, it is determined that the change in the residual hydrogen amount can be compensated with the available electric energy of the high voltage battery 8, and the vehicle is previously started off. It is possible to maintain the drivable distance in the city as it is (step S17). Thereafter, the drivable distance may be output to the user through the display unit 103 (step S7).

Alternatively, if the converted electric energy is greater than the available electric energy received from the high voltage battery, it is determined that it is impossible to compensate for the change in the amount of residual hydrogen with the available electric energy of the high voltage battery 8, and the user is notified that the drivable distance has changed. A message can be output (step S16).

Thereafter, the drivable distance is calculated based on the learned fuel efficiency and the measured fuel efficiency of the engine through the control unit 102 (step S6), and the drivable distance of the vehicle according to the calculated residual hydrogen amount is displayed by the user through the display unit 103. can be output to (step S7).

The above description is merely illustrative of the technical idea of the present invention, and various modifications, changes, and substitutions are possible within the range that does not depart from the essential characteristics of the present invention by those of ordinary skill in the art to which the present invention pertains. will be. Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are for explaining, not limiting, the technical spirit of the present invention, and the scope of the technical spirit of the present invention is not limited by these embodiments and the accompanying drawings . The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

1: motor
2: Reducer
3: fuel cell stack
4: junction box
5: LDC
6: HDC
7: Low voltage battery
8: high voltage battery
9: front wheel
10: rear wheel
100: drivable distance display system
101: hydrogen storage unit
1011: hydrogen tank
102: control unit
103: display unit
104: leak diagnosis unit

Claims (10)

In a vehicle comprising a fuel cell stack and a hydrogen storage unit,
turning on the ignition of the vehicle;
calculating the remaining amount of hydrogen by measuring the pressure and temperature of at least one hydrogen tank in the hydrogen storage unit;
comparing the calculated residual amount of hydrogen with the residual amount of hydrogen stored when the vehicle was previously turned off;
outputting a drivable distance of the vehicle according to the calculated remaining hydrogen amount to a user when the calculated remaining hydrogen amount is the same as the stored hydrogen remaining amount when the vehicle was previously turned off;
determining whether the vehicle is parked for a long time if the calculated residual amount of hydrogen is smaller than the amount of hydrogen stored when the vehicle was previously turned off;
determining a threshold value of a change in the residual amount of hydrogen in the hydrogen storage unit by hydrogen permeation for each parking time of the vehicle when the vehicle is in a long-term parking state;
comparing the determined residual hydrogen amount change threshold value with the hydrogen residual amount change amount of the hydrogen storage unit;
determining that the change amount of the residual hydrogen amount is due to hydrogen permeation of the hydrogen storage unit when the threshold value of the change in the residual hydrogen amount is greater than the change in the residual hydrogen amount;
converting the change amount of the hydrogen residual amount into electrical energy;
comparing the converted electric energy with available electric energy received from a high voltage battery of the vehicle;
maintaining a drivable distance when the vehicle was previously turned off when the converted electric energy is less than the available electric energy received from the high voltage battery; and
When the converted electric energy is greater than the available electric energy received from the high voltage battery, outputting the drivable distance of the vehicle according to the calculated remaining amount of hydrogen to the user;
A drivable distance display method, characterized in that it is determined whether the hydrogen storage unit leaks or hydrogen permeates according to whether the vehicle is parked for a long time, and the drivable distance of the vehicle according to the calculated remaining amount of hydrogen is output to a user. The method of claim 1,
The step of determining whether the vehicle is parked for a long time,
Receiving the parking time information of the vehicle; the drivable distance display method further comprising a. The method of claim 1,
The step of determining whether the vehicle is parked for a long time,
determining that the amount of change in the residual amount of hydrogen in the hydrogen storage unit is due to hydrogen leakage in the hydrogen storage unit when the vehicle is not in a long-term parking state;
outputting a drivable distance of the vehicle according to the calculated remaining amount of hydrogen to a user; and
The drivable distance display method further comprising; diagnosing whether the hydrogen storage unit is leaking hydrogen. delete delete The method of claim 1,
Comparing the determined residual hydrogen amount change threshold value with the hydrogen residual amount change amount of the hydrogen storage unit,
determining that the change in the residual amount of hydrogen is due to hydrogen leakage from the hydrogen storage unit when the threshold value of the change in the residual amount of hydrogen is smaller than the change in the amount of change in the residual amount of hydrogen;
outputting a drivable distance of the vehicle according to the calculated remaining amount of hydrogen to a user; and
The drivable distance display method further comprising; diagnosing whether the hydrogen storage unit is leaking hydrogen. delete The method of claim 1,
After the step of maintaining the drivable distance when the vehicle was previously turned off when the converted electrical energy is less than the available electrical energy received from the high voltage battery,
The drivable distance display method further comprising; outputting the drivable distance to the user. delete The method of claim 1,
The high voltage battery of the vehicle,
A drivable distance display method, characterized in that when the vehicle needs high output, the output is supported, and when the idle energy is generated, the electric energy is stored.

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