# US 2018/0022341 A1 · Method and apparatus of determining performance for battery for mild hybrid electric vehicle

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- Number: US 2018/0022341 A1
- Document ID: US20180022341A1
- Status: Published application
- Kind: A1
- Application number: 15/341,268
- Filed: 2016-11-02
- Published: 2018-01-25
- Earliest claimed: 2016-07-19
- Assignees: Hyundai Motor Company
- Applicants: Hyundai Motor Company
- Inventors: Hwa Yong Jang
- Web page: https://patentgrep.com/patent/US20180022341A1

## CPC

- B60K 6/485: Motor-assist type
- B60L 53/00: Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L 53/56: Mechanical storage means, e.g. fly wheels
- B60L 58/13: Maintaining the SoC within a determined range
- B60T 1/10: by utilising wheel movement for accumulating energy, e.g. driving air compressors
- B60T 8/172: Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters {(B60T8/17551 takes precedence)}
- B60T 11/10: transmitting by fluid means, e.g. hydraulic
- B60W 10/08: including control of electric propulsion units, e.g. motors or generators
- B60W 10/26: for electrical energy, e.g. batteries or capacitors
- B60W 20/14: in conjunction with braking regeneration
- F16D 61/00: Brakes with means for making the energy absorbed available for use (F16D57/00 takes precedence)
- B60K 2006/268: {Electric drive motor starts the engine, i.e. used as starter motor}
- B60L 2250/16: by display
- B60T 2270/60: Regenerative braking
- B60T 2270/604: Merging friction therewith; Adjusting their repartition
- B60W 2510/244: Charge state
- B60W 2520/10: Longitudinal speed
- B60W 2540/10: Accelerator pedal position
- B60W 2540/12: Brake pedal position
- B60Y 2300/18125: Regenerative braking
- B60Y 2300/91: Battery charging
- B60Y 2400/112: Batteries
- B60Y 2400/81: Braking systems
- Y02E 60/10: Energy storage using batteries
- Y02T 10/62: Hybrid vehicles
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- Y02T 10/7072: Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
- Y02T 90/12: Electric charging stations
- Y02T 90/14: Plug-in electric vehicles
- Y10S 903/947: Characterized by control of braking, e.g. blending of regeneration, friction braking
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- 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
- B60T: VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL (electrodynamic brake systems for vehicle, in general B60L; brakes per se, i.e. devices where braking effect occurs, including ultimate brake actuators, F16D); ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60W: CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A method for determining performance of a battery for a mild hybrid electric vehicle may include detecting a speed of the mild hybrid electric vehicle, a position value of an accelerator pedal, a position value of a brake pedal, and a state of charge (SOC) of the battery, determining whether a regenerative braking condition is satisfied, determining a demand braking amount of a driver, determining a regenerative braking allowance, operating a mild hybrid starter and generator (MHSG) to generate regenerative braking torque corresponding to the regenerative braking allowance, determining a target SOC increment amount, determining an actual SOC increment amount, and determining that the performance of the battery is deteriorated when a difference in value between the target SOC increment amount and the actual SOC increment amount is equal to or greater than a reference value.

## Claims

### Claim 1

A method for determining performance of a battery for a mild hybrid electric vehicle, the method comprising:
detecting, by a data detector, a speed of the mild hybrid electric vehicle, a position value of an accelerator pedal, a position value of a brake pedal, and a state of charge (SOC) of the battery;
determining, by a controller, whether a regenerative braking condition is satisfied based on the speed of the mild hybrid electric vehicle, the position value of the accelerator pedal, and the position value of the brake pedal;
determining, by the controller, a demand braking amount of a driver based on the speed of the mild hybrid electric vehicle and the position value of the brake pedal when the regenerative braking condition is satisfied;
determining, by the controller, a regenerative braking allowance based on the demand braking amount of the driver and the SOC of the battery;
operating, by the controller, a mild hybrid starter and generator (MHSG) to generate regenerative braking torque corresponding to the regenerative braking allowance;
determining, by the controller, a target SOC increment amount corresponding to the regenerative braking allowance;
determining, by the controller, an actual SOC increment amount based on the SOC of the battery; and
determining, by the controller, that the performance of the battery is deteriorated when a difference in value between the target SOC increment amount and the actual SOC increment amount is equal to or greater than a reference value.

### Claim 2 (depends on 1)

The method of claim 1, wherein the regenerative braking condition is satisfied when the speed of the mild hybrid electric vehicle is greater than a predetermined speed, the position value of the accelerator pedal is a predetermined position value, and the position value of the brake pedal is greater than a predetermined position value.

### Claim 3 (depends on 1)

The method of claim 1, further comprising:
determining, by the controller, a friction braking amount based on the demand braking amount of the driver and the regenerative braking allowance; and
operating, by the controller, a hydraulic pressure actuator to cause a wheel cylinder to generate friction braking force corresponding to the friction braking amount.

### Claim 4 (depends on 1)

The method of claim 1, further comprising operating, by the controller, a display device to display a warning lamp or warning message when the performance of the battery is determined to be deteriorated.

### Claim 5 (depends on 1)

The method of claim 1, wherein the battery is an absorptive glass mat (AGM) battery and a lithium-ion battery.

### Claim 6

An apparatus for determining performance of a battery for a mild hybrid electric vehicle, the apparatus comprising:
a mild hybrid starter and generator engine (MHSG) for starting an engine or generating electricity according to an output of the engine;
a battery supplying electricity to the MHSG and charged with electricity recovered through the MHSG;
a vehicle speed sensor for detecting a speed of the mild hybrid electric vehicle;
an accelerator pedal position sensor for detecting a position value of an accelerator pedal;
a brake pedal position sensor for detecting a position value of a brake pedal;
a state of charge (SOC) sensor for detecting an SOC of the battery; and
a controller for determining performance of the battery based on the speed of the mild hybrid electric vehicle, the position value of the accelerator pedal, the position value of the brake pedal, and the SOC of the battery,
wherein the controller determines a demand braking amount of a driver when a regenerative braking condition is satisfied, determines a regenerative braking allowance based on the demand braking amount of the driver and the SOC of the battery, operates the MHSG to generate regenerative braking torque corresponding to the regenerative braking allowance, determines a target SOC increment amount corresponding to the regenerative braking allowance, determines an actual SOC increment amount based on the SOC of the battery, and determines that the performance of the battery is deteriorated when a difference value between the target SOC increment amount and the actual SOC increment amount is equal to or greater than a reference value.

### Claim 7 (depends on 6)

The apparatus of claim 6, wherein the regenerative braking condition is satisfied when the speed of the mild hybrid electric vehicle is greater than a predetermined speed, the position value of the accelerator pedal is a predetermined position value, and the position value of the brake pedal is greater than a predetermined position value.

### Claim 8 (depends on 6)

The apparatus of claim 6, wherein the controller determines a friction braking amount based on the demand braking amount of the driver and the regenerative braking allowance, and operates a hydraulic pressure actuator to cause a wheel cylinder to generate friction braking force corresponding to the friction braking amount.

### Claim 9 (depends on 6)

The apparatus of claim 6, further comprising a display device displaying information processed by the controller, wherein the controller operates the display device to display a warning lamp or warning message when the performance of the battery is determined to be deteriorated.

### Claim 10 (depends on 6)

The apparatus of claim 6, wherein the battery is an absorptive glass mat (AGM) battery and a lithium-ion battery.