Apparatus for compensating for torque of fuel cell electric vehicle and method thereof

Patent metadata

Field	Value
Publication number	US-2016144719-A1
Application number	US-201514701802-A
Country	US
Kind code	A1
Filing date	May 1, 2015
Priority date	Nov 26, 2014
Publication date	May 26, 2016
Grant date	—

Abstract

An apparatus for compensating for torque of a fuel cell electric vehicle includes: a storage configured to store a first look-up table in which pedal amount correction coefficients corresponding to degradation rates of a fuel cell stack are recorded and a second look-up table in which torques corresponding to pedal amounts are recorded; a degradation rate calculator configured to calculate a degradation rate based on a maximum voltage and an output voltage of the fuel cell stack; a correction coefficient searcher configured to search for a correction coefficient corresponding to the calculated degradation rate using the first look-up table; a pedal amount detector configured to detect a pedal amount indicating a degree to which an acceleration pedal is pressed; and a torque compensator configured to compensate for torque by compensating for the detected pedal amount based on the searched correction coefficient using the second look-up table.

First claim

What is claimed is:

1 . An apparatus for compensating for torque of a fuel cell electric vehicle, the apparatus comprising:
a storage configured to store a first look-up table in which pedal amount correction coefficients corresponding to degradation rates of a fuel cell stack are recorded and a second look-up table in which torques corresponding to pedal amounts are recorded; a degradation rate calculator configured to calculate a degradation rate (α) based on a maximum voltage (V P ) and an output voltage (V O ) of the fuel cell stack; a correction coefficient searcher configured to search for a correction coefficient (β) corresponding to the calculated degradation rate using the first look-up table; a pedal amount detector configured to detect a pedal amount (P b ) indicating a degree to which an acceleration pedal is pressed; and a torque compensator configured to compensate for torque by compensating for the detected pedal amount based on the searched correction coefficient using the second look-up table.

2 . The apparatus according to claim 1 , wherein the degradation rate calculator is further configured to calculate the degradation rate using Equation A, as follows:

α
=

V
O

V
P

×
100.

3 . The apparatus according to claim 1 , wherein the degradation rate calculator includes a voltage measurement instrument configured to measure the output voltage of the fuel cell stack.

4 . The apparatus according to claim 1 , wherein the degradation rate calculator is further configured to calculate a moving average of a plurality of degradation rates calculated during a threshold period of time, as a final degradation rate.

5 . The apparatus according to claim 1 , wherein the torque compensator is further configured to compensate for the pedal amount using Equation B, as follows:
P s =(1+β)× P b ,
wherein P s is a post-compensation pedal amount, and P b is a prior-compensation pedal amount.

6 . A method for compensating for torque of a fuel cell electric vehicle, the method comprising:
storing, in a storage, a first look-up table in which pedal amount correction coefficients corresponding to degradation rates of a fuel cell stack are recorded and a second look-up table in which torques corresponding to pedal amounts are recorded; calculating, by a degradation rate calculator, a degradation rate (α) based on a maximum voltage (V P ) and an output voltage (V O ) of the fuel cell stack; searching, by a correction coefficient searcher, for a correction coefficient (β) corresponding to the calculated degradation rate using the first look-up table; detecting, by a pedal amount detector, a pedal amount (P b ) indicating a degree to which an acceleration pedal is pressed; and compensating, by a torque compensator, for torque by compensating for the detected pedal amount based on the searched correction coefficient using the second look-up table.

7 . The method of claim 6 , further comprising calculating, by the degradation rate calculator, the degradation rate using Equation A, as follows:

α
=

V
O

V
P

×
100.

8 . The method according to claim 6 , wherein the calculating of the degradation rate comprises measuring, by a voltage measurement instrument, the output voltage of the fuel cell stack.

9 . The method according to claim 6 , further comprising calculating, by the degradation rate calculator, a moving average of a plurality of degradation rates calculated during a threshold period of time, as a final degradation rate.

10 . The method according to claim 6 , further comprising compensating, by the torque compensator, for the pedal amount using Equation B, as follows:
P s =(1+β)× P b ,
wherein P s is a post-compensation pedal amount, and P b is a prior-compensation pedal amount.

11 . A non-transitory computer readable medium containing program instructions for compensating for torque of a fuel cell electric vehicle, the computer readable medium comprising:
program instructions that calculate a degradation rate (α) using a maximum voltage (V P ) and an output voltage (V O ) of a fuel cell stack; program instructions that search for a correction coefficient (β) corresponding to the calculated degradation rate using a stored first look-up table, in which pedal amount correction coefficients corresponding to degradation rates of the fuel cell stack are recorded; program instructions that detect a pedal amount (P b ) indicating a degree to which an acceleration pedal is pressed; and program instructions that compensate for torque by compensating for the detected pedal amount based on the searched correction coefficient using a stored second look-up table, in which torques corresponding to pedal amounts are recorded.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Ryu Seong Pil
• Ok Sung Suk
• Kim Ji Tae
• Lee Kyu Il

Classifications

• Y02E60/50

  Fuel cells · CPC title

• B60L15/20 Primary

  for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed · CPC title

• B60L11/1881

  Operations & Transport · mapped topic

• B60L3/0053 Primary

  relating to fuel cells · CPC title

• B60L58/30

  for monitoring or controlling fuel cells · CPC title