# US 8,788,183 B2 · Engine idle speed control system and method for vehicular gear

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- Number: US 8,788,183 B2
- Document ID: US8788183B2
- Status: Granted
- Kind: B2
- Application number: 13/193,078
- Filed: 2011-07-28
- Published: 2012-02-02
- Granted: 2014-07-22
- Earliest claimed: 2010-07-29
- Assignees: Kwang Yang Motor Co., Ltd.
- Applicants: Chun-Hsiung Chen
- Inventors: Chun-Hsiung Chen
- Web page: https://patentgrep.com/patent/US8788183B2

## CPC

- F02N 11/0822: {related to action of the driver}
- B60W 30/18018: {Start-stop drive, e.g. in a traffic jam}
- F02N 11/0825: {related to prevention of engine restart failure, e.g. disabling automatic stop at low battery state}
- B60W 2510/0208: Clutch engagement state, e.g. engaged or disengaged
- B60W 2510/0604: Throttle position
- B60W 2510/0638: Engine speed
- B60W 2510/101: Transmission neutral state
- B60W 2520/10: Longitudinal speed
- F02D 2200/502: Neutral gear position
- F02N 11/0833: {Vehicle conditions (F02N11/0822, F02N11/0825 take precedence)}
- F02N 2200/022: Engine speed
- F02N 2200/023: Engine temperature
- F02N 2200/063: Battery voltage
- F02N 2200/0801: Vehicle speed
- F02N 2200/0802: Transmission state, e.g. gear ratio or neutral state
- F02N 2200/0803: Parking brake state
- F02N 2200/103: Clutch pedal position
- F02N 2300/2011: Control involving a delay; Control involving a waiting period before engine stop or engine start
- Y02T 10/40: Engine management systems
- F02N: STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- 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
- 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

An engine idle speed control system and a method for a vehicular gear are provided. The system includes an electronic controller, an engine connected to an ignition unit and a fuel supply unit, a battery, a starter switch connected to the battery, and a starter motor connected to the starter switch. The engine has a gear mechanism and a clutch which is connected to a clutch lever. The electronic controller is connected to a vehicle speed sensor, a throttle position sensor, and an engine revolution speed sensor. The clutch lever with a node switch provides a lever node control signal, the gear mechanism with a gear node switch provides a gear node control signal, and the electronic controller is connected to the node switch of the clutch lever and the gear node switch of the gear mechanism, so as to control automatic idle speed stop and start of the engine.

## Claims

### Claim 1

An engine idle speed control system for a vehicular gear, comprising an electronic controller, an engine, a battery, a starter switch electrically connected to the battery, a starter motor electrically connected to the starter switch, and an ignition unit and a fuel supply unit connected to the engine, wherein the engine has a gear mechanism and a clutch, the clutch is connected to a clutch lever, the electronic controller is connected to a vehicle speed sensor, a throttle position sensor and an engine revolution speed sensor,
the clutch lever is provided with a node switch to provide a lever node control signal, the gear mechanism is provided with a gear node switch to provide a gear node control signal, and the electronic controller is electrically connected to the node switch of the clutch lever and the gear node switch of the gear mechanism, so as to control automatic idle speed stop and start of the engine,
wherein the vehicle further comprises a side stand node switch electrically connected to the electronic controller, and the electronic controller is used to control forced idle speed stop of the engine when the side stand node switch is in a parking state, and
wherein the vehicle further comprises a forced idle speed stop switch electrically connected to the electronic controller, and the electronic controller is used to control manual idle speed stop of the engine if the forced idle speed stop switch is turned on.

### Claim 2 (depends on 1)

The engine idle speed control system for the vehicular gear according to claim 1, wherein the fuel supply unit comprises a fuel pump and a fuel injector, and the ignition unit comprises an ignition coil and a spark plug.

### Claim 3

An engine idle speed control method for a vehicular gear, wherein an electronic controller judges operation information of a vehicle, controls idle speed stop of an engine and restarts the engine, and the control method comprising:
determining that a vehicle speed is zero, a throttle position is a predetermined original value, the engine is in an idle speed state, content information of an acquired gear node control signal is neutral and content information of a clutch lever node control signal is “off”, and controlling automatic idle speed stop of the engine by the electronic controller after a predetermined period,
when the engine is in a predetermined period of idle speed stop,
determining that the clutch lever node control signal is “on” by the electronic controller, and
starting the engine by the electronic controller, and
when the engine is in an idle speed stop state and the predetermined period is exceeded,
pressing a starter switch to start the engine.

### Claim 4

An engine idle speed control method for a vehicular gear, wherein an electronic controller judges operation information of a vehicle, controls idle speed stop of an engine and restarts the engine, and the control method comprising:
determining that a vehicle speed is zero, a throttle position is a predetermined original value, the engine is in an idle speed state, content information of an acquired gear node control signal is neutral and content information of a clutch lever node control signal is a parking state, determining that a side stand node switch is “off”, and controlling forced idle speed stop of the engine by the electronic controller,
when the engine is in a predetermined period of idle speed stop,
determining that the content information of the clutch lever node control signal is “on” by the electronic controller, and
starting the engine by the electronic controller, and
when the engine is in an idle speed stop state and the predetermined period is exceeded,
pressing a starter switch to start the engine.

### Claim 5

An engine idle speed control method for a vehicular gear, wherein an electronic controller judges operation information of a vehicle, controls idle speed stop of an engine and restarts the engine, and the control method comprises:
determining that a vehicle speed is zero, a throttle position is a predetermined original value, the engine is in an idle speed state, content information of an acquired gear node control signal is neutral and content information of a clutch lever node control signal is “off”, and determining that a forced idle speed switch is turned on, controlling manual idle speed stop of the engine by the electronic controller,
when the engine is in a predetermined period of idle speed stop,
determining that the content information of the clutch lever node control signal is “on” by the electronic controller, and
starting the engine by the electronic controller, and
when the engine is in an idle speed stop state and the predetermined period is exceeded
pressing a starter switch to start the engine.