# US 11,305,750 B2 · Method and system for controlling starting of mild hybrid electric vehicle

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- Number: US 11,305,750 B2
- Document ID: US11305750B2
- Status: Granted
- Kind: B2
- Application number: 16/513,247
- Filed: 2019-07-16
- Published: 2020-10-08
- Granted: 2022-04-19
- Earliest claimed: 2019-04-03
- Assignees: Hyundai Motor Company; Kia Motors Corporation
- Applicants: Hyundai Motor Company; Kia Motors Corporation
- Inventors: Jungsup Byun; Seungwoo Lee; Minkyu Han
- Web page: https://patentgrep.com/patent/US11305750B2

## CPC

- B60W 20/00: Control systems specially adapted for hybrid vehicles {(hybrid vehicle design, B60K6/00; electric vehicles B60L)}
- B60K 6/26: characterised by the motors or the generators
- B60K 6/485: Motor-assist type
- B60W 10/06: including control of combustion engines
- B60W 10/08: including control of electric propulsion units, e.g. motors or generators
- B60W 20/40: Controlling the engagement or disengagement of prime movers, e.g. for transition between prime movers {(power-up or power-down of the driveline B60W30/192)}
- F02D 41/061: {the corrections being time dependent}
- F02D 41/064: {at cold start (F02D41/067 takes precedence)}
- F02D 41/3076: {with special conditions for selecting a mode of combustion, e.g. for starting, for diagnosing}
- B60K 2006/268: {Electric drive motor starts the engine, i.e. used as starter motor}
- B60W 2510/0638: Engine speed
- B60W 2510/0676: Engine temperature
- B60W 2510/244: Charge state
- B60W 2510/246: Temperature
- B60W 2520/10: Longitudinal speed
- B60W 2540/10: Accelerator pedal position
- B60W 2710/0616: Position of fuel or air injector
- F02D 41/062: {for starting (F02D41/061 takes precedence)}
- F02D 2200/021: Engine temperature
- F02D 2200/101: Engine speed
- F02D 2200/501: Vehicle speed
- F02D 2200/503: Battery correction, i.e. corrections as a function of the state of the battery, its output or its type
- F02D 2200/602: Pedal position
- Y02T 10/62: Hybrid vehicles
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- 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
- 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
- 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)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A method for controlling starting of a mild hybrid vehicle includes receiving a starting-request signal and in response, increasing a rotation speed of the engine by driving the MHSG by electricity supplied from a battery. Status data of the mild hybrid vehicle for controlling starting of the engine is monitored to obtain an engine rotation speed from the status data and determine an injection-starting rotation speed based on the status data. When the engine rotation speed is greater than the injection-starting rotation speed, fuel injection of the engine is started.

## Claims

### Claim 1

A method for controlling starting of a mild hybrid vehicle, comprising:
receiving, by a controller, a starting-request signal;
increasing, by the controller, a rotation speed of the engine by driving a mild hybrid starter-generator (MHSG) by electricity supplied from a battery, in response to receiving the starting-request signal;
monitoring, by the controller, status data of the mild hybrid vehicle for controlling starting of the engine;
obtaining, by the controller, an engine rotation speed from the status data;
determining, by the controller, an injection-starting rotation speed based on the status data;
determining, by the controller, whether the engine rotation speed is greater than the injection-starting rotation speed; and
starting, by the controller, fuel injection of the engine when the engine rotation speed is greater than the injection-starting rotation speed,
wherein determining the injection-starting rotation speed includes:
determining, by the controller, a reference rotation speed based on a coolant temperature, a temperature of the battery, and a state of charge (SOC) of the battery;
determining, by the controller, a predetermined rotation speed based on a vehicle speed and a position value of an accelerator pedal; and
determining, by the controller, the injection-starting rotation speed based on the reference rotation speed, a temperature of the MHSG, and the predetermined rotation speed.

### Claim 2 (depends on 1)

The method of claim 1, wherein the injection-starting rotation speed is determined using at least one of a coolant temperature, a temperature of the battery, a state of charge (SOC) of the battery, a temperature of the MHSG, a vehicle speed, and a position value of the accelerator pedal that are included in the status data.

### Claim 3 (depends on 1)

The method of claim 1, wherein determining the reference rotation speed includes:
retrieving, by the controller, an available power of the battery corresponding with the temperature of the battery and the SOC of the battery from a predetermined power table; and
retrieving, by the controller, the reference rotation speed corresponding with the coolant temperature and the available power of the battery from a predetermined control table.

### Claim 4 (depends on 1)

The method of claim 1, wherein the determining the predetermined rotation speed includes:
retrieving, by the controller, the predetermined rotation speed corresponding with the vehicle speed and the position value of the accelerator pedal from a predetermined speed table.

### Claim 5 (depends on 1)

The method of claim 1, wherein the injection-starting rotation speed is determined by an equation of RPM_I=TH*F−S, wherein RPM_I indicates the injection-starting rotation speed, TH indicates the reference rotation speed, F indicates a temperature factor of the MHSG, and S indicates the predetermined rotation speed.

### Claim 6 (depends on 1)

The method of claim 1, further comprising:
determining, by the controller, a lapsed time after receiving the starting-request signal, when the engine rotation speed is less than the injection-starting rotation speed;
determining, by the controller, whether the lapsed time is greater than a predetermined time;
determining, by the controller, whether the engine rotation speed is within a reference range, when the lapsed time is greater than a predetermined time; and
starting, by the controller, fuel injection of the engine when the engine rotation speed is within the reference range.

### Claim 7

A system for controlling starting of a mild hybrid vehicle, comprising:
a vehicle controller configured to receive a start-request signal and in response, increase a rotation speed of an engine by driving a mild hybrid starter-generator (MHSG) by electricity supplied from a battery; and
a data detection unit configured to detect status data to control starting of the mild hybrid vehicle,
wherein the vehicle controller is further configured to:
retrieve an available power of the battery corresponding with the temperature of the battery and the SOC of the battery from a predetermined power table; and
retrieve the reference rotation speed corresponding with the coolant temperature and the available power of the battery from a predetermined control table,
wherein the vehicle controller is configured to,
monitor the status data of the mild hybrid vehicle detected by the data detection unit,
obtain an engine rotation speed from the status data;
determine an injection-starting rotation speed based on the status data;
determine whether the engine rotation speed is greater then the injection-starting rotation speed; and
start fuel injection of the engine when the engine rotation speed is greater than the injection-starting rotation speed.

### Claim 8 (depends on 7)

The system of claim 7, wherein the data detection unit includes a coolant temperature sensor, a first temperature sensor, a state-of-charge (SOC) sensor, a second temperature sensor, a vehicle speed sensor, an accelerator pedal position sensor (APS), and an engine speed sensor.

### Claim 9 (depends on 7)

The system of claim 7, wherein the vehicle controller is further configured to:
determine a reference rotation speed based on a coolant temperature, a temperature of the battery, and a state of charge (SOC) of the battery;
determine a predetermined rotation speed based on a vehicle speed and a position value of an accelerator pedal; and
determine the injection-starting rotation speed based on the reference rotation speed, a temperature of the MHSG, and the predetermined rotation speed.

### Claim 10 (depends on 7)

The system of claim 7, wherein the vehicle controller is further configured to:
determine a lapsed time after receiving the starting-request signal, when the engine rotation speed is less than the injection-starting rotation speed;
determine whether the lapsed time is greater than a predetermined time;
determine whether the engine rotation speed is within a reference range, when the lapsed time is greater than a predetermined time; and
start fuel injection of the engine when the engine rotation speed is within the reference range.