# US 11,306,671 B2 · Method and apparatus for controlling part load mode engine torque

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- Number: US 11,306,671 B2
- Document ID: US11306671B2
- Status: Granted
- Kind: B2
- Application number: 16/694,505
- Filed: 2019-11-25
- Published: 2020-11-26
- Granted: 2022-04-19
- Earliest claimed: 2019-05-23
- Assignees: Hyundai Motor Company; Kia Motors Corporation
- Applicants: Hyundai Motor Company; Kia Motors Corporation
- Inventors: Kyung Taek Lee; Gi Young Kwon; Dong Jun Shin
- Web page: https://patentgrep.com/patent/US11306671B2

## CPC

- F02D 41/04: Introducing corrections for particular operating conditions (F02D41/14 takes precedence)
- B60K 6/48: Parallel type
- B60L 3/0023: {Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train}
- B60L 50/16: with provision for separate direct mechanical propulsion
- B60L 58/12: responding to state of charge [SoC]
- B60L 58/14: Preventing excessive discharging
- B60W 10/06: including control of combustion engines
- B60W 10/08: including control of electric propulsion units, e.g. motors or generators
- B60W 20/13: in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
- B60W 20/15: Control strategies specially adapted for achieving a particular effect
- B60W 20/50: Control strategies for responding to system failures, e.g. for fault diagnosis, failsafe operation or limp mode
- F02D 41/0072: {Estimating, calculating or determining the EGR rate, amount or flow (sensors in EGR systems F02M26/45)}
- F02D 41/1475: {Regulating the air fuel ratio at a value other than stoichiometry}
- F02D 41/222: {relating to the failure of sensors or parameter detection devices}
- F02M 26/49: Detecting, diagnosing or indicating an abnormal function of the EGR system
- B60K 2006/4825: {Electric machine connected or connectable to gearbox input shaft}
- B60L 2240/443: Torque
- B60L 2240/66: Ambient conditions
- B60W 2510/0676: Engine temperature
- B60W 2510/244: Charge state
- B60W 2710/0666: Engine torque
- B60W 2710/083: Torque
- F02D 41/3076: {with special conditions for selecting a mode of combustion, e.g. for starting, for diagnosing}
- F02D 2200/023: Temperature of lubricating oil or working fluid
- F02D 2200/0414: Air temperature
- F02D 2200/503: Battery correction, i.e. corrections as a function of the state of the battery, its output or its type
- F02D 2200/703: Atmospheric pressure
- F02D 2250/18: Control of the engine output torque
- Y02T 10/40: Engine management systems
- 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 10/72: Electric energy management in electromobility
- Y02T 90/16: Information or communication technologies improving the operation of electric vehicles
- F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W)
- 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
- 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
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A method and apparatus for controlling part load mode engine torque are provided. The method includes setting a limitation of part load mode engine torque based on a current traveling environment and calculating a first engine torque variation in the basis of state information of a battery. When the first engine torque variation is calculated, a second engine torque variation is calculated based on a measured engine error amount. The limitation of part load mode engine torque is compensated based on the calculated first and second engine torque variations.

## Claims

### Claim 1

A method of controlling part load mode engine torque, comprising:
setting, by a controller, a limitation of part load mode engine torque based on a current traveling environment;
calculating, by the controller, a first engine torque variation based on state information of a battery;
when the first engine torque variation is calculated, calculating, by the controller, a second engine torque variation based on a measured engine error amount; and
compensating, by the controller, the limitation of part load mode engine torque based on the calculated first and second engine torque variations.

### Claim 2 (depends on 1)

The method of claim 1, wherein the calculating of the first engine torque variation includes:
determining, by the controller, whether a battery state of charge (SOC) is less than a first reference value;
when the battery SOC is less than the first reference value, determining, by the controller, whether driving energy per unit distance is greater than a second reference value; and
when the driving energy per unit distance is greater than the second reference value, calculating, by the controller, the first engine torque variation corresponding to the state information of the battery.

### Claim 3 (depends on 2)

The method of claim 2, further comprising:
when the battery SOC is equal to or greater than the first reference value or the driving energy per unit distance is equal to or less than the second reference value, setting, by the controller, the limitation of part load mode engine torque based on the current driving environment.

### Claim 4 (depends on 1)

The method of claim 1, wherein the calculating of the second engine torque variation includes:
determining, by the controller, whether an absolute value of a lambda error amount per unit distance is greater than a third reference value;
when the absolute value of the lambda error amount per unit distance is greater than the third reference value, determining, by the controller, whether an absolute value of an exhaust gas recirculation (EGR) error amount per unit distance is greater than a fourth reference value; and
when the absolute value of the EGR error amount per unit distance is greater than the fourth reference value, calculating, by the controller, the second engine torque variation, based on the engine error amount.

### Claim 5 (depends on 4)

The method of claim 4, further comprising:
when the absolute value of the lambda error amount per unit distance is equal to or less than the third reference value or the absolute value of the EGR error amount per unit distance is equal to or less than the fourth reference value, compensating, by the controller, for the limitation of part load mode engine torque by the first engine torque variation.

### Claim 6 (depends on 1)

The method of claim 1, wherein the limitation of part load mode engine torque is set by considering at least one factor selected from the group consisting of: engine knocking, an air intake temperature, an atmospheric pressure condition, and an oil temperature as the driving environment.

### Claim 7 (depends on 1)

The method of claim 1, wherein the state information of the battery includes information which is measured through at least one selected from the group consisting of: a battery state of charge (SOC), an accumulation amount of a battery current value, and driving energy per unit distance.

### Claim 8

An apparatus for controlling part load mode engine torque for a hybrid vehicle, comprising:
a demand torque calculation unit configured to calculate a limitation of part load mode engine torque, based on a vehicle driving environment;
a torque compensation unit configured to compensate the limitation of part load mode engine torque by calculating a first engine torque variation based on state information of a battery and calculate a second engine torque variation based on an engine error amount; and
an engine controller configured to set the limitation of part load mode engine torque compensated based on the calculated first and second torque variations as a limitation of engine drive torque to drive an engine of the vehicle.

### Claim 9 (depends on 8)

The apparatus of claim 8, wherein, when a battery state of charge (SOC) is less than a first reference value and driving energy per unit distance is greater than a second reference value, the torque compensation unit is configured to calculate the first engine torque variation.

### Claim 10 (depends on 8)

The apparatus of claim 8, wherein the engine error amount includes at least one of a lambda error amount and an exhaust gas recirculation (EGR) error amount.

### Claim 11 (depends on 10)

The apparatus of claim 10, wherein when the lambda error amount is greater than a third reference value and the EGR error amount is greater than a fourth reference value, the torque compensation unit is configured to calculate the second engine torque variation.

### Claim 12 (depends on 11)

The apparatus of claim 11, wherein when the lambda error amount is equal to or less than the third reference value or the EGR error amount is equal to or less than the fourth reference value, the torque compensation unit is configured to compensate for the limitation of part load mode engine torque by the first engine torque variation.

### Claim 13 (depends on 8)

The apparatus of claim 8, wherein the state information of the battery includes information which is measured using at least one of a battery state of charge (SOC), an accumulation amount of a battery current value, and driving energy per unit distance.

### Claim 14 (depends on 8)

The apparatus of claim 8, wherein the vehicle driving environment includes at least one factor selected from the group consisting of: engine knocking, an air intake temperature, an atmospheric pressure condition, and an oil temperature.