# US 10,370,002 B2 · Engine control method for preventing engine stall for vehicle on sloped road

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- Number: US 10,370,002 B2
- Document ID: US10370002B2
- Status: Granted
- Kind: B2
- Application number: 15/289,575
- Filed: 2016-10-10
- Published: 2017-06-15
- Granted: 2019-08-06
- Earliest claimed: 2015-12-14
- Assignees: Hyundai Motor Company
- Applicants: Hyundai Motor Company
- Inventors: Tae-Kwang Eom; Jung-Suk Han; Chang-Hyun Lim; Hyeok-Jun Kwon
- Web page: https://patentgrep.com/patent/US10370002B2

## CPC

- B60W 30/18118: {Hill holding}
- B60W 10/06: including control of combustion engines
- B60W 10/18: including control of braking systems
- B60W 30/18027: {Drive off, accelerating from standstill}
- B60W 2510/1005: Transmission ratio engaged
- B60W 2510/101: Transmission neutral state
- B60W 2520/10: Longitudinal speed
- B60W 2540/12: Brake pedal position
- B60W 2540/16: Ratio selector position
- B60W 2552/15: Road slope, i.e. the inclination of a road segment in the longitudinal direction
- B60W 2710/0644: Engine speed
- B60W 2710/065: Idle condition
- B60W 2710/0666: Engine torque
- B60W 2710/18: Braking system
- 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

## Abstract

An engine control method for preventing an engine of a vehicle from stalling on a sloped road includes steps of: detecting whether a shifting lever is in a neutral stage (N-stage); measuring a vehicle speed and a slope angle of the sloped road, and calculating a load acting on a vehicle body on the sloped road; accelerating an engine a first time to increase an engine RPM so that an engine torque is larger than the load; and accelerating the engine a second time to move the vehicle when the shifting lever enters into a driving gear stage (D-stage).

## Claims

### Claim 1

An engine control method for preventing an engine of a vehicle from stalling on a sloped road, comprising steps of:
detecting whether a shifting lever is in a neutral stage (N-stage) when the vehicle that is parked or stopped on a sloped road;
measuring a vehicle speed and a slope angle of the sloped road, and calculating a load acting on a vehicle body on the sloped road;
accelerating an engine a first time to increase an engine revolution per minute (RPM) so that an engine torque is larger than the load when the shifting lever is in the neutral stage; and
accelerating the engine a second time to move the vehicle when the shifting lever enters into a driving gear stage (D-stage).

### Claim 2 (depends on 1)

The engine control method of claim 1, wherein the step of accelerating the engine the first time further comprises the steps of:
determining whether the measured vehicle speed is the same or greater than a predetermined value;
operating a brake when the measured vehicle speed is the same or greater than the predetermined value; and
calculating a changed load depending on a reduced vehicle speed when the vehicle speed is less than the predetermined value, and adjusting the engine RPM such that the engine torque corresponds to the changed load.

### Claim 3 (depends on 1)

The engine control method of claim 1, wherein the step of accelerating the engine the first time comprises the steps of:
detecting whether a brake of the vehicle is engaged by a driver; and
stopping an acceleration control for increasing the engine RPM when the brake of the vehicle is engaged.

### Claim 4 (depends on 3)

The engine control method of claim 3, further comprising a step of an engine acceleration for increasing the engine RPM so that the engine torque is greater than the load by calculating the load acting on the vehicle body depending on a detected vehicle speed and the slope angle of the slope road when the brake of the vehicle is engaged and the detected vehicle speed is greater than 0.

### Claim 5 (depends on 1)

The engine control method of claim 1, wherein the step of accelerating an engine a second time further comprises the steps of:
detecting an acceleration of the vehicle body during one working cycle after a driver shifts the shifting lever into the D-stage; and
returning the increased engine RPM to an original idle RPM by determining that the vehicle starts normally with the D-stage on the slope road when the acceleration of the vehicle body is greater than 0 and the D-stage shifting of a transmission is maintained during the one working cycle.