# US 2014/0156128 A1 · Stop method of vehicle electrical power system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0156128 A1 - Document ID: US20140156128A1 - Status: Published application - Kind: A1 - Application number: 14/093,832 - Filed: 2013-12-02 - Published: 2014-06-05 - Earliest claimed: 2012-11-30 - Assignees: Honda Motor Co., Ltd. - Applicants: Honda Motor Co., Ltd. - Inventors: Chihiro WAKE; Takuya SHIRASAKA; Go KIKUCHI - Web page: https://patentgrep.com/patent/US20140156128A1 ## CPC - B60L 58/12: responding to state of charge [SoC] - B60L 1/003: {to auxiliary motors, e.g. for pumps, compressors} - B60L 1/02: to electric heating circuits - B60L 58/30: for monitoring or controlling fuel cells - B60L 58/31: for starting of fuel cells - B60L 58/33: by cooling - B60L 58/40: for controlling a combination of batteries and fuel cells - B60L 2210/10: DC to DC converters - B60L 2240/36: Temperature of vehicle components or parts - H01M 8/02: Details (electrodes H01M4/86 - H01M4/98) - H01M 8/04: Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids - Y02E 60/50: Fuel cells - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - Y02T 10/72: Electric energy management in electromobility - Y02T 90/40: Application of hydrogen technology to transportation, e.g. using fuel cells - B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A fuel cell system executes charge processing to charge electric power generated by a stack to a battery, and sealed discharge processing to cause an oxygen concentration inside a cathode flow channel to decrease, after a stop operation has been made on a power switch. The stop method of a fuel cell system includes: a step of calculating a remaining charge time corresponding to a time in which charge processing can be executed, by subtracting a time required in sealed discharge processing from a predetermined stop processing permitted time, after a stop operation has been made on the power switch (Step S52), a step of calculating a remaining target charge amount of the battery (Step S54), a step of executing charge processing while controlling output of the stack based on the remaining charge time and remaining target charge amount (Step S56), and a step of executing sealed discharge processing. ## Claims ### Claim 1 A stop method of a vehicle electrical power system that includes: a fuel cell that generates electric power when fuel gas is supplied to an anode flow channel and oxidant gas is supplied to a cathode flow channel; an electrical storage device that stores electric power generated by the fuel cell; a stop switch that generates a signal to cause electric power generation by way of the fuel cell to stop; and a load that is driven by way of supply of electric power from the fuel cell or the electrical storage device, wherein, after the stop switch has been operated, the system executes charge processing to charge electric power generated by the fuel cell to the electrical storage device, and concentration adjustment processing to adjust a concentration of gas inside at least one of the anode flow channel and the cathode flow channel, the method comprising the steps of: calculating a charge time corresponding to a time in which charge processing can be executed, after the stop switch has been operated, by subtracting a time required in the concentration adjustment processing from a predetermined stop processing permitted time; calculating a target charge amount of the electrical storage device; executing the charging processing while controlling output of the fuel cell based on the charge time and the target charge amount; and executing the concentration adjustment processing after the charge processing has ended. ### Claim 2 (depends on 1) The stop method of a vehicle electrical power system according to claim 1, wherein a withdrawn extent of electric power from the electrical storage device upon a next startup of the vehicle electrical power system is estimated, and the target charge amount is set to a larger value as the withdrawn extent increases, in the step of calculating a target charge amount. ### Claim 3 (depends on 2) The stop method of a vehicle electrical power system according to claim 2, wherein it is determined whether a season in which the stop switch was operated is winter, and in a case of being winter, the target charge amount is set to a larger value than in a case of being a season other than winter, in the step of calculating a target charge amount. ### Claim 4 (depends on 3) The stop method of a vehicle electrical power system according to claim 3, wherein it is determined whether a current startup of the vehicle electrical power system is a low-temperature startup that is a startup under a low-temperature environment, and in a case of being a low-temperature startup, a vehicle startup time corresponding to a time period since the vehicle electrical power system was started until the stop switch was operated is acquired, and in a case of the vehicle startup time being shorter than a predetermined time, the target charge amount is set to a larger value than a case of the vehicle startup time being longer than the predetermined time, in the step of calculating a target charge amount. ### Claim 5 (depends on 4) The stop method of a vehicle electrical power system according to claim 4, wherein a value obtained by dividing a value obtained by subtracting a consumed energy of the load from an output energy of the fuel cell, by an energy inputted to the fuel cell in order to generate electric power with the fuel cell, is defined as net efficiency, wherein the load includes a compressor that supplies air as oxidant gas to the cathode flow channel, and wherein, in the step of executing the charging processing while controlling output of the fuel cell, the output of the fuel cell is controlled so that charging of the target charge amount completes within the charge time and the net efficiency in the charge processing reaches an optimum. ### Claim 6 (depends on 5) The stop method of a vehicle electrical power system according to claim 5, wherein the load includes a cooling device that cools the fuel cell, and wherein, in the step of executing the charging processing while controlling output of the fuel cell, a net efficiency in a case of performing charge processing by controlling the output of the fuel cell to a predetermined first output value while cooling the fuel cell by way of the cooling device is calculated as a first net efficiency, a net efficiency in a case of performing charge processing by controlling the output of the fuel cell to a second output value that is smaller than the first output value so that cooling of the fuel cell by way of the cooling device is not necessary is calculated as a second net efficiency, and the output of the fuel cell is controlled to the first output value in a case of the first net efficiency being larger than the second net efficiency, and the output of the fuel cell is controlled to the second output value in a case of the first net efficiency being no more than the second net efficiency. ### Claim 7 (depends on 6) The stop method of a vehicle electrical power system according to claim 6, wherein the concentration adjustment processing includes concentration reduction processing to cause an oxygen concentration inside of the cathode flow channel to decrease. ### Claim 8 (depends on 1) The stop method of a vehicle electrical power system according to claim 1, wherein it is determined whether a season in which the stop switch was operated is winter, and in a case of being winter, the target charge amount is set to a larger value than in a case of being a season other than winter, in the step of calculating a target charge amount. ### Claim 9 (depends on 1) The stop method of a vehicle electrical power system according to claim 1, wherein it is determined whether a current startup of the vehicle electrical power system is a low-temperature startup that is a startup under a low-temperature environment, and in a case of being a low-temperature startup, a vehicle startup time corresponding to a time period since the vehicle electrical power system was started until the stop switch was operated is acquired, and in a case of the vehicle startup time being shorter than a predetermined time, the target charge amount is set to a larger value than a case of the vehicle startup time being longer than the predetermined time, in the step of calculating a target charge amount. ### Claim 10 (depends on 1) The stop method of a vehicle electrical power system according to claim 1, wherein a value obtained by dividing a value obtained by subtracting a consumed energy of the load from an output energy of the fuel cell, by an energy inputted to the fuel cell in order to generate electric power with the fuel cell, is defined as net efficiency, wherein the load includes a compressor that supplies air as oxidant gas to the cathode flow channel, and wherein, in the step of executing the charging processing while controlling output of the fuel cell, the output of the fuel cell is controlled so that charging of the target charge amount completes within the charge time and the net efficiency in the charge processing reaches an optimum. ### Claim 11 (depends on 10) The stop method of a vehicle electrical power system according to claim 10, wherein the load includes a cooling device that cools the fuel cell, and wherein, in the step of executing the charging processing while controlling output of the fuel cell, a net efficiency in a case of performing charge processing by controlling the output of the fuel cell to a predetermined first output value while cooling the fuel cell by way of the cooling device is calculated as a first net efficiency, a net efficiency in a case of performing charge processing by controlling the output of the fuel cell to a second output value that is smaller than the first output value so that cooling of the fuel cell by way of the cooling device is not necessary is calculated as a second net efficiency, and the output of the fuel cell is controlled to the first output value in a case of the first net efficiency being larger than the second net efficiency, and the output of the fuel cell is controlled to the second output value in a case of the first net efficiency being no more than the second net efficiency. ### Claim 12 (depends on 1) The stop method of a vehicle electrical power system according to claim 1, wherein the concentration adjustment processing includes concentration reduction processing to cause an oxygen concentration inside of the cathode flow channel to decrease. ### Claim 13 (depends on 12) The stop method of a vehicle electrical power system according to claim 12, wherein it is determined whether a season in which the stop switch was operated is winter, and in a case of being winter, the target charge amount is set to a larger value than in a case of being a season other than winter, in the step of calculating a target charge amount. ### Claim 14 (depends on 12) The stop method of a vehicle electrical power system according to claim 12, wherein it is determined whether a current startup of the vehicle electrical power system is a low-temperature startup that is a startup under a low-temperature environment, and in a case of being a low-temperature startup, a vehicle startup time corresponding to a time period since the vehicle electrical power system was started until the stop switch was operated is acquired, and in a case of the vehicle startup time being shorter than a predetermined time, the target charge amount is set to a larger value than a case of the vehicle startup time being longer than the predetermined time, in the step of calculating a target charge amount. ### Claim 15 (depends on 12) The stop method of a vehicle electrical power system according to claim 12, wherein a value obtained by dividing a value obtained by subtracting a consumed energy of the load from an output energy of the fuel cell, by an energy inputted to the fuel cell in order to generate electric power with the fuel cell, is defined as net efficiency, wherein the load includes a compressor that supplies air as oxidant gas to the cathode flow channel, and wherein, in the step of executing the charging processing while controlling output of the fuel cell, the output of the fuel cell is controlled so that charging of the target charge amount completes within the charge time and the net efficiency in the charge processing reaches an optimum. ### Claim 16 (depends on 15) The stop method of a vehicle electrical power system according to claim 15, wherein the load includes a cooling device that cools the fuel cell, and wherein, in the step of executing the charging processing while controlling output of the fuel cell, a net efficiency in a case of performing charge processing by controlling the output of the fuel cell to a predetermined first output value while cooling the fuel cell by way of the cooling device is calculated as a first net efficiency, a net efficiency in a case of performing charge processing by controlling the output of the fuel cell to a second output value that is smaller than the first output value so that cooling of the fuel cell by way of the cooling device is not necessary is calculated as a second net efficiency, and the output of the fuel cell is controlled to the first output value in a case of the first net efficiency being larger than the second net efficiency, and the output of the fuel cell is controlled to the second output value in a case of the first net efficiency being no more than the second net efficiency. ### Claim 17 A stop method of a vehicle electrical power system that includes: an electric power generation means; an electrical storage device that stores electric power generated by the electric power generation means; and a stop switch that generates a signal to cause the electric power generation means to stop, wherein the system executes charge processing to charge electric power generated by the electric power generation means to the electrical storage device after the stop switch has been operated, the method comprising the steps of: calculating a target charge amount of the electrical storage device after the stop switch has been operated; and executing the charge processing by controlling output of the electric power generation means based on the target charge amount, wherein a withdrawn extent of electric power from the electrical storage device upon a next startup of the vehicle electrical power system is estimated, and the target charge amount is set to a larger value as the withdrawn extent increases, in the step of calculating a target charge amount.