# US 2013/0152898 A1 · Variable ignition type diesel-gasoline dual fuel powered combustion engine, system, and method

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- Number: US 2013/0152898 A1
- Document ID: US20130152898A1
- Status: Published application
- Kind: A1
- Application number: 13/714,177
- Filed: 2012-12-13
- Published: 2013-06-20
- Earliest claimed: 2011-12-15
- Assignees: Hyundai Motor Company
- Inventors: Minyoung KI; Dae CHOI; Hyunsung JUNG; Seungil PARK; Hyeungwoo LEE; Yohan CHI
- Web page: https://patentgrep.com/patent/US20130152898A1

## CPC

- F02P 5/00: Advancing or retarding ignition; Control therefor
- F02D 19/0649: {Liquid fuels having different boiling temperatures, volatilities, densities, viscosities, cetane or octane numbers}
- F02D 19/081: {Adjusting the fuel composition or mixing ratio; Transitioning from one fuel to the other}
- F02D 41/0025: {Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures}
- F02D 41/064: {at cold start (F02D41/067 takes precedence)}
- F02D 41/068: {for warming-up}
- F02D 41/3047: {said means being a secondary injection of fuel}
- F02D 41/3076: {with special conditions for selecting a mode of combustion, e.g. for starting, for diagnosing}
- F02D 2200/021: Engine temperature
- Y02T 10/30: Use of alternative fuels, e.g. biofuels
- F02P: IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES ({anti-pollution means for internal-combustion engines F02B17/00}; specially adapted for rotary-piston or oscillating-piston engines F02B53/12; {ignition of gas turbine plants F02C7/26; ignition of jet propulsion plants F02K9/95; starting of combustion engines F02N9/00}; ignition of combustion apparatus in general, glowing plugs F23Q; measuring of physical variables in general G01; controlling in general G05; data processing in general G06; electrical components in general see Section H; {ignition coils H01F38/12}; sparking plugs H01T13/00)
- 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 variable ignition type diesel-gasoline dual fuel powered combustion engine and control method can select spark ignition or compression ignition depending on the engine operating range. The variable ignition type diesel-gasoline dual fuel powered combustion engine includes a cylinder block formed of a plurality of cylinders each being connected to an air intake manifold sucking air or a gasoline fuel-mixed air and an exhaust manifold exhausting an exhaust gas after combustions; and an ECU controlling the combustion modes. The engine operating ranges are judged by the speed and load of the engine. When the range is the high load range or the low load range, a gasoline fuel combustion is performed, and when the range is between the high load range and the low load range, a diesel-gasoline dual fuel powered step is performed.

## Claims

### Claim 1

A variable ignition type diesel-gasoline dual fuel powered combustion engine comprising:
a cylinder block including a plurality of cylinders, each cylinder connected to an air intake manifold for receiving air or a gasoline-mixed air and an exhaust manifold discharging an exhaust gas after combustions;
a spark plug provided for each cylinder;
a diesel fuel injector provided for each cylinder; and
an electronic control unit (ECU) controlling the engine in such a way that engine operating ranges are judged, and when the range is the high load range or the low load range, a gasoline-mixed air is sucked into the interior of the cylinder and is spark-ignited by the spark plug, and when the range is between the low load range and the high load range, a gasoline-mixed air is sucked into the interior of the cylinder and a diesel fuel is injected by way of the diesel injector, so the diesel-gasoline fuels are compressed and ignited.

### Claim 2 (depends on 1)

The variable ignition type diesel-gasoline dual fuel powered combustion engine according to claim 1, wherein the ECU is configured to judge the engine operating ranges based on the speed and the load.

### Claim 3

A method for controlling a variable ignition type diesel-gasoline dual fuel powered combustion engine in which a spark plug and a diesel fuel injector are provided in the interior of a cylinder, and air or a gasoline-mixed air is introduced by way of an air intake manifold and is spark-ignited or compression-ignited in the interior of the cylinder, comprising:
a cold driving judgment step for judging whether or not an engine is warmed up by measuring the temperature of cooling water;
an engine operating range judgment step for judging the engine operating range of an engine based on the speed and the load of the engine when it is judged that the engine is warmed up as a result of the judgment in the cold driving judgment step; and
a combustion mode application step for driving in the previously set combustion mode of the engine depending on the engine operating range determined in the engine operating range judgment step.

### Claim 4 (depends on 3)

The method for controlling a variable ignition type diesel-gasoline dual fuel powered combustion engine according to claim 3, wherein when it is judged that the range is the high load range or the low load range in the engine operating range judgment step, a gasoline fuel combustion step is performed, in which only the gasoline-mixed air is supplied to the interior of the cylinder and is spark-ignited.

### Claim 5 (depends on 4)

The method for controlling a variable ignition type diesel-gasoline dual fuel powered combustion engine according to claim 4, wherein when it is judged that the engine is not warmed up in the cold driving judgment step, the gasoline fuel combustion step is performed.

### Claim 6 (depends on 3)

The method for controlling a variable ignition type diesel-gasoline dual fuel powered combustion engine according to claim 3, wherein when it is judged that the range is between the low load range and the high load range in the engine operating range judgment step, a mixed fuel combustion is performed, in which the diesel-gasoline fuels are mixed and combusted using the diesel fuel droplets ignited by a compression and ignition by sucking a gasoline-premixed air and injecting a diesel fuel.

### Claim 7 (depends on 3)

The method for controlling a variable ignition type diesel-gasoline dual fuel powered combustion engine according to claim 3, wherein after the combustion mode application step, an engine stop judgment step is performed for judging whether or not an engine is stopped, and when it is judged that the engine is not stopped in the engine stop judgment step, the cold driving judgment step is performed.

### Claim 8

A variable ignition type diesel-gasoline dual fuel powered combustion system which is formed of a plurality of cylinders, each cylinder being equipped with a spark plug and a diesel fuel injector, and air or a gasoline-mixed air is introduced into each cylinder, and an electronic control unit (ECU) is configured to control a gasoline fuel combustion, a diesel fuel combustion or a gasoline-diesel fuel combustion depending on an engine operating range, comprising:
an ECU controlling an engine to operate with one selected among a diesel-gasoline fuel combustion and a gasoline fuel combustion depending on the engine operating range by judging the engine operating ranges.

### Claim 9 (depends on 8)

The variable ignition type diesel-gasoline dual fuel powered combustion system according to claim 8, wherein the ECU controls the engine to operate in such a way that when the engine operating range is the high load range or the low load range, a gasoline-mixed air is sucked into the interior of the cylinder and is spark-ignited by the spark plug.

### Claim 10 (depends on 8)

The variable ignition type diesel-gasoline dual fuel powered combustion system according to claim 8, wherein the ECU controls the engine to operate in such a way that when the engine operating range is between the low load range and the high load range, a gasoline-mixed air is sucked into the interior of the cylinder, and a diesel fuel is injected by way of the diesel injector, and a diesel-gasoline fuel is compressed and ignited.