EP0108582A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Fuel oil injection engine using gas
Assignee: CRYOGAS ENGINEERING Ltd
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Filing: 1983-10-31
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Granted: —
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Expires: 2003-10-31
Abstract
Abstract The circulatory fuel oil injection supply system (1) of a diesel engine is adapted so that the engine may be run selectively either in a single fuel mode on diesel oil alone or in a dual-fuel mode on both diesel oil and gas. The control system and fuel system of the engine are modified so that pressure conditions at a diesel oil injection metering device (M) during the single fuel mode are mimicked by a first flow restrictor (R 2 ) during the dual-fuel mode. A pressure sensor measures the mimicked pressure and controls the amount of gas flow to the engine via an electronic programmable control. A shut-off first solenoid valve (S,) operative in the single fuel mode circuit is by-passed in the dual-fuel mode while second and third solenoid valves (S 2 ,S 3 ) are operative to open a by-pass line including a second flow restrictor (R,) and to open a reference pressure supply line respectively. A governor control (G) and a throttle control (TC) having a by-pass weep line (W) remain operative in both the single fuel mode and in the dual-fuel mode. In a further modification the first flow restrictor (R 2 ) and third solenoid valve (S 3 ) and the second flow restrictor (R 2 ) and the second solenoid valve (5 2 ) are replaced by respective pulsed solenoid valves providing variable flow restrictors so as to allow a variable amount of pilot diesel fuel oil to be supplied in the dual-fuel mode via the electronic control.
Inventors
- 👤 Timothy James Bedford
- 👤 Paul James O'sullivan
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 08:24
CPC Classifications
B; B26; B26D; B26D3/00; B26D3/006; F; F02; F02B; F02B69/00; F02B69/02; F02B69/04; F02B7/00; F02B7/06; F02D; F02D19/00; F02D19/06; F02D19/0602; F02D19/0607; F02D19/0626; F02D19/0628; F02D19/0663; F02D19/0673; F02D19/0678; F02D19/08; F02D19/10; F02D19/105; F02M; F02M43/00; F02B3/00; F02B3/06; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/30
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
243 words
A method of adapting a fuel injection engine, for example a diesel engine, to run in a dual-fuel mode on a gaseous main fuel such as natural gas and also on fuel oil, said method comprising: a) modifying the existing fuel oil injection supply system by setting up a reference or control link between said injection supply system and a system installed for supplying said main fuel to the combustion chamber or chambers of the engine, said main fuel supply system being such that at least part of the existing fuel oil injection supply control system, for example a throttle control and governor control, is usable, during the dual-fuel mode of operation, to influence the said reference or control link and thereby to control, or to aid in controlling, the supply of said main fuel; b) also modifying said existing fuel oil injection supply system so that fuel oil is supplied to the combustion chamber or chambers of the engine, in use in the dual fuel mode, in the form of pilot shots of fuel oil, said installed main fuel supply system also being such that at least of part of the existing fuel oil injection supply control system, for example a throttle control and governor control, is still usable, during the dual fuel mode of operation, to control, or to aid in controlling, said supply of the pilot shots of fuel oil to the engine combustion chamber or chambers of the engine.
Claim 2
Independent Claim
243 words
A method of adapting a fuel injection engine, for example a diesel engine, to run in a dual-fuel mode on a gaseous main fuel such as natural gas and also on fuel oil, said method comprising: a) modifying the existing fuel oil injection supply system by setting up a reference or control link between said injection supply system and a system installed for supplying said main fuel to the combustion chamber or chambers of the engine, said main fuel supply system being such that at least part of the existing fuel oil injection supply control system, for example a throttle control and governor control, is usable, during the dual-fuel mode of operation, to influence the said reference or control link and thereby to control, or to aid in controlling, the supply of said main fuel; b) also modifying said existing fuel oil injection supply system so that fuel oil is supplied to the combustion chamber or chambers of the engine, in use in the dual fuel mode, in the form of pilot shots of fuel oil, said installed main fuel supply system also being such that at least of part of the existing fuel oil injection supply control system, for example a throttle control and governor control, is still usable, during the dual fuel mode of operation, to control, or to aid in controlling, said supply of the pilot shots of fuel oil to the engine combustion chamber or chambers of the engine.
Claim 3
Dependent Claim
130 words
A method as claimed in Claim 1 in which said existing fuel oil injection supply system is modified so that in use in the dual-fuel mode the amount of main fuel supplied to said combustion chamber or chambers is related to the pressure developed in said fuel oil injection supply system, and preferably in which said existing fuel oil injection supply system is modified by providing a reference supply line and by providing a by-pass supply line, and preferably in which said reference supply line and/or said by-pass supply line includes a flow restrictor, and preferably in which the or each flow restrictor is a variable flow restrictor, for example a pulsable solenoid valve, and preferably in which said reference supply line and by-pass supply line have a common branch.
Claim 4
Independent Claim
176 words
A method of adapting a fuel injection engine, for example a diesel engine, to run in a dual-fuel mode on a gaseous main fuel such as natural gas and also on fuel oil, said method comprising: a) modifying the existing fuel oil injection supply system, including establishing an operative link therebetween and a supply system installed for supplying said main fuel, and enabling at least part of the existing fuel oil injection supply control system to be usable, during the dual-fuel mode of operation, to control by way of said modified fuel oil injection supply system, the amount of main fuel supplied to a combustion chamber or chambers of the engine; and b) also modifying said existing fuel oil injection supply system to enable it, during the dual-fuel mode of operation, to supply, also under the control of at least part of the existing fuel oil injection supply control system, pilot shots of fuel oil which are fed to the combustion chamber or chambers to ignite the main fuel supplied to said combustion chamber or chambers.
Claim 5
Independent Claim
176 words
A method of adapting a fuel injection engine, for example a diesel engine, to run in a dual-fuel mode on a gaseous main fuel such as natural gas and also on fuel oil, said method comprising: a) modifying the existing fuel oil injection supply system, including establishing an operative link therebetween and a supply system installed for supplying said main fuel, and enabling at least part of the existing fuel oil injection supply control system to be usable, during the dual-fuel mode of operation, to control by way of said modified fuel oil injection supply system, the amount of main fuel supplied to a combustion chamber or chambers of the engine; and b) also modifying said existing fuel oil injection supply system to enable it, during the dual-fuel mode of operation, to supply, also under the control of at least part of the existing fuel oil injection supply control system, pilot shots of fuel oil which are fed to the combustion chamber or chambers to ignite the main fuel supplied to said combustion chamber or chambers.
Claim 6
Dependent Claim
201 words
A dual-fuel fuel oil injection engine comprising a fuel oil injection supply line to one or more combustion chambers of the engine, the fuel oil injection supply line being connected into a fuel oil circulatory system which includes a fuel oil throttle control of the engine, a fuel oil reference supply line connected as part of the circulatory system downstream of the throttle control, a flow restrictor connected in the reference supply line, sensor means responsive to pressure in the reference supply line, and a gaseous fuel supply system including gaseous fuel supply regulator means, the arrangenent being such that, in use, pilot shots of fuel oil are injected into said one or more combustion chambers in synchronized manner by way of injector means from said injection supply line and such that the pressure in the reference supply line varies according to engine speed and throttle control setting, the varying pressure in the reference supply line between the throttle control and restrictor being applied, by way of said sensor means, to control the setting of said regulator means and thereby vary the amount of gas supplied to said combustion chamber or chambers for ignition by the pilot shots of fuel oil.
Claim 7
Dependent Claim
201 words
A dual-fuel fuel oil injection engine comprising a fuel oil injection supply line to one or more combustion chambers of the engine, the fuel oil injection supply line being connected into a fuel oil circulatory system which includes a fuel oil throttle control of the engine, a fuel oil reference supply line connected as part of the circulatory system downstream of the throttle control, a flow restrictor connected in the reference supply line, sensor means responsive to pressure in the reference supply line, and a gaseous fuel supply system including gaseous fuel supply regulator means, the arrangenent being such that, in use, pilot shots of fuel oil are injected into said one or more combustion chambers in synchronized manner by way of injector means from said injection supply line and such that the pressure in the reference supply line varies according to engine speed and throttle control setting, the varying pressure in the reference supply line between the throttle control and restrictor being applied, by way of said sensor means, to control the setting of said regulator means and thereby vary the amount of gas supplied to said combustion chamber or chambers for ignition by the pilot shots of fuel oil.
Claim 8
Dependent Claim
391 words
A dual-fuel fuel oil injection engine adapted for selective running on the fuel oil as a sole fuel in a single-fuel mode or on fuel oil and on gas in a dual-fuel mode, said engine comprising a circulatory fuel oil supply system, pump means to circulate the fuel oil around the supply system, an engine driven governor control connected in said fuel oil supply system upstream of a throttle control which is in turn upstream of a first flow control valve which is in turn upstream of a metering device for metering the amount of fuel oil injected into one or more combustion chambers of the engine, the arrangement being such that when said first flow control valve is open, in use fuel oil is supplied to the metering device under pressure which is a function of the governor control speed and of the throttle control setting and the amount of fuel oil injected into said combustion chamber or chambers is dependent upon said pressure and upon engine speed during the single fuel mode of the engine, the circulatory fuel oil supply system also having a by-pass line which includes a second flow control valve and Which by-passes the first flow control valve in order to allow fuel to flow through to said metering device when said first flow control valve is shut off or inoperative and when the second flow control valve is opened for running the engine in its dual-fuel mode, the circulatory fuel oil supply system further comprising a reference supply line which is connected from a point downstream of the throttle control to a point downstream of the metering device and which includes a third flow control valve and metering device mimic means operative in the dual-fuel mode such that said mimic means is effective to mimic or simulate in the reference supply line the pressure conditions set up downstream of the first flow control valve by the metering device when operating in the single fuel mode, the engine also being provided with sensor means responsive to the pressure in the reference supply line and arranged to control in accordance with said pressure the amount of gas supplied to said combustion chamber or chambers, during the dual-fuel mode, for ignition by pilot fuel oil shots injected by way of the by-pass line and through the metering device.
Claim 9
Dependent Claim
391 words
A dual-fuel fuel oil injection engine adapted for selective running on the fuel oil as a sole fuel in a single-fuel mode or on fuel oil and on gas in a dual-fuel mode, said engine comprising a circulatory fuel oil supply system, pump means to circulate the fuel oil around the supply system, an engine driven governor control connected in said fuel oil supply system upstream of a throttle control which is in turn upstream of a first flow control valve which is in turn upstream of a metering device for metering the amount of fuel oil injected into one or more combustion chambers of the engine, the arrangement being such that when said first flow control valve is open, in use fuel oil is supplied to the metering device under pressure which is a function of the governor control speed and of the throttle control setting and the amount of fuel oil injected into said combustion chamber or chambers is dependent upon said pressure and upon engine speed during the single fuel mode of the engine, the circulatory fuel oil supply system also having a by-pass line which includes a second flow control valve and Which by-passes the first flow control valve in order to allow fuel to flow through to said metering device when said first flow control valve is shut off or inoperative and when the second flow control valve is opened for running the engine in its dual-fuel mode, the circulatory fuel oil supply system further comprising a reference supply line which is connected from a point downstream of the throttle control to a point downstream of the metering device and which includes a third flow control valve and metering device mimic means operative in the dual-fuel mode such that said mimic means is effective to mimic or simulate in the reference supply line the pressure conditions set up downstream of the first flow control valve by the metering device when operating in the single fuel mode, the engine also being provided with sensor means responsive to the pressure in the reference supply line and arranged to control in accordance with said pressure the amount of gas supplied to said combustion chamber or chambers, during the dual-fuel mode, for ignition by pilot fuel oil shots injected by way of the by-pass line and through the metering device.
Claim 10
Independent Claim
353 words
A method of adapting a diesel engine to run as a dual-fuel engine, said diesel engine being of a type which has a circulatory fuel oil injection supply system, for example a "Cummins" diesel engine having a "PT" fuel injection system, said diesel engine further being of a type having an engine driven governor control arranged to vary the pressure in the circulatory fuel oil injection supply system in accordance with engine speed, said governor control being connected into the circulatory system upstream of a throttle control and a first valve means, said first valve means being operative to allow fuel oil to be supplied under pressure to a metering device of the engine which injects fuel oil into a combustion chamber or chambers of the engine, and said pressure being a function of the engine speed (by way of the governor control) and of the throttle setting so that the greater the throttle setting the more fuel oil is injected into the combustion chamber or chambers, said method comprising: a) installing a by-pass line including second valve means in the circulatory supply system so as to by-pass the location of the first valve means in the supply system so that with the second valve means operative fuel oil can pass through said by-pass line to the metering device of the engine to provide pilot shots of fuel oil in the dual-fuel mode of operation; b) installing downstream of the throttle control and upstream of the location of the first valve means a reference supply line including third valve means and metering device mimic means which, during dual fuel operation of the engine, mimics the varying pressure conditions developed at the metering device which previously took place while running the diesel engine before adaptation to a dual-fuel engine; and c) connecting the diesel engine to a gas supply through gas supply control means arranged to be responsive to the pressure developed in the reference supply line in the dual-fuel mode thereby to control the amount of gas fed to the combustion chambers or chambers for ignition by the pilot fuel oil injected therein.
Claim 11
Independent Claim
353 words
A method of adapting a diesel engine to run as a dual-fuel engine, said diesel engine being of a type which has a circulatory fuel oil injection supply system, for example a "Cummins" diesel engine having a "PT" fuel injection system, said diesel engine further being of a type having an engine driven governor control arranged to vary the pressure in the circulatory fuel oil injection supply system in accordance with engine speed, said governor control being connected into the circulatory system upstream of a throttle control and a first valve means, said first valve means being operative to allow fuel oil to be supplied under pressure to a metering device of the engine which injects fuel oil into a combustion chamber or chambers of the engine, and said pressure being a function of the engine speed (by way of the governor control) and of the throttle setting so that the greater the throttle setting the more fuel oil is injected into the combustion chamber or chambers, said method comprising: a) installing a by-pass line including second valve means in the circulatory supply system so as to by-pass the location of the first valve means in the supply system so that with the second valve means operative fuel oil can pass through said by-pass line to the metering device of the engine to provide pilot shots of fuel oil in the dual-fuel mode of operation; b) installing downstream of the throttle control and upstream of the location of the first valve means a reference supply line including third valve means and metering device mimic means which, during dual fuel operation of the engine, mimics the varying pressure conditions developed at the metering device which previously took place while running the diesel engine before adaptation to a dual-fuel engine; and c) connecting the diesel engine to a gas supply through gas supply control means arranged to be responsive to the pressure developed in the reference supply line in the dual-fuel mode thereby to control the amount of gas fed to the combustion chambers or chambers for ignition by the pilot fuel oil injected therein.
Claim 12
Independent Claim
228 words
A method of adapting a single-fuel mode fuel oil injection engine in which the amount of fuel oil injected into the engine varies with the pressure in a fuel oil supply line of a fuel oil circulatory system, said pressure varying in accordance with a throttle control setting and the fuel oil being injected by way of a metering device which meters different amounts of fuel oil into a combustion chamber or chambers of the engine in accordance with the said pressure in the fuel oil supply line, said method comprising adapting the engine to run in a dual-fuel mode by providing means for said fuel oil to be supplied to the metering device through alternative flow control means operative in the dual-fuel mode and by connecting into the circulatory system a reference supply line which is adapted to provide for close mimicking in the dual-fuel mode of the effect of the fuel flow constraints imposed by the metering device in the single-fuel mode, and utilizing the pressure in the reference supply line to control the amount of gas supplied to the combustion chamber or chambers for ignition by pilot shots of fuel oil fed by way of the metering device into said chamber or chambers and supplied by way of said alternative flow control means so that the engine is adapted to run in a dual-fuel mode.
Claim 13
Independent Claim
228 words
A method of adapting a single-fuel mode fuel oil injection engine in which the amount of fuel oil injected into the engine varies with the pressure in a fuel oil supply line of a fuel oil circulatory system, said pressure varying in accordance with a throttle control setting and the fuel oil being injected by way of a metering device which meters different amounts of fuel oil into a combustion chamber or chambers of the engine in accordance with the said pressure in the fuel oil supply line, said method comprising adapting the engine to run in a dual-fuel mode by providing means for said fuel oil to be supplied to the metering device through alternative flow control means operative in the dual-fuel mode and by connecting into the circulatory system a reference supply line which is adapted to provide for close mimicking in the dual-fuel mode of the effect of the fuel flow constraints imposed by the metering device in the single-fuel mode, and utilizing the pressure in the reference supply line to control the amount of gas supplied to the combustion chamber or chambers for ignition by pilot shots of fuel oil fed by way of the metering device into said chamber or chambers and supplied by way of said alternative flow control means so that the engine is adapted to run in a dual-fuel mode.
Claim 14
Dependent Claim
176 words
A dual-fuel fuel oil injection engine comprising a fuel oil injection supply line to one or more combustion chambers of the engine, the fuel oil injection supply line being connected into a fuel oil circulatory system downstream of a fuel oil throttle control of the engine, a fuel oil reference supply line connected downstream of the throttle control and as part of the circulatory system and a flow restrictor being connected in the reference supply line, the arrangement being such that, in use, pilot shots of fuel oil are injected into said one or more combustion chambers in synchronized manner by way of said injection supply line and by way of pump means and the pressure in the reference supply line varies according to engine speed and throttle control setting, the varying pressure in the reference supply line between the throttle control and restrictor being used to vary, by way of sensor means of the engine, the amount of gas supplied to said combustion chamber or chambers for ignition by the pilot shots of fuel oil.
Claim 15
Dependent Claim
176 words
A dual-fuel fuel oil injection engine comprising a fuel oil injection supply line to one or more combustion chambers of the engine, the fuel oil injection supply line being connected into a fuel oil circulatory system downstream of a fuel oil throttle control of the engine, a fuel oil reference supply line connected downstream of the throttle control and as part of the circulatory system and a flow restrictor being connected in the reference supply line, the arrangement being such that, in use, pilot shots of fuel oil are injected into said one or more combustion chambers in synchronized manner by way of said injection supply line and by way of pump means and the pressure in the reference supply line varies according to engine speed and throttle control setting, the varying pressure in the reference supply line between the throttle control and restrictor being used to vary, by way of sensor means of the engine, the amount of gas supplied to said combustion chamber or chambers for ignition by the pilot shots of fuel oil.
Claim 16
Dependent Claim
518 words
A dual-fuel oil injection engine adapted for selective running on the fuel oil as the sole fuel in a single-fuel mode or on fuel oil and on gas simultaneously in a dual-fuel mode, said engine comprising a circulatory fuel oil supply system, pump means to circulate the fuel oil around the supply system, a governor control drivable from a moving part of the engine and connected in said fuel oil supply system upstream of a throttle control which is in turn upstream of a first solenoid valve which is in turn upstream of a metering device for metering the amount of fuel oil injected into one or more combustion chambers of the engine, the arrangement being such that on operation of said first solenoid valve fuel oil is capable of being supplied to the metering device under pressure which is a function of the governor control speed and of the throttle control setting, the amount of fuel oil injected into said combustion chamber or chambers being dependent upon said pressure and upon engine speed during the single-fuel mode of the engine, the engine further comprising a by-pass line in the circulatory fuel oil supply system, said by-pass line being connected downstream of the throttle control but upstream of the first solenoid valve, and downstream of the first solenoid valve and upstream of the metering device, in order to allow fuel to flow through the by-pass line by-passing the first solenoid valve when said first solenoid valve is shut-off and when a second solenoid valve in the by-pass line is operative while running the engine in its dual-fuel mode, the engine further comprising a reference supply line connected downstream of the throttle control and downstream of the metering device, a third solenoid valve being provided in the reference supply line, said second and third solenoid valves providing variable flow restrictors and being electrically pulsable in co-operative manner, the third solenoid valve providing metering device mimic means which in use in the dual-fuel mode is effective to produce mimicking of the pressure conditions set up by the metering device in the single-fuel mode, and the reference supply line being connected to sensor means responsive to the pressure in the reference supply line to thereby control the amount of gas supplied to said combustion chamber or chambers, when said third solenoid valve is operative during the dual-fuel mode, for ignition by fuel oil injected by way of the by-pass line when the second solenoid valve is operative and through the metering device, the arrangement being such that in the single-fuel mode the first solenoid valve is operative with the second and third solenoid valves shut off, and during the dual-fuel mode the engine operates with the first solenoid valve shut off and the second and third solenoid valves operative, the second solenoid valve being pulsable to allow a variable amount of fuel oil to be injected into said combustion chamber or chambers to vary the ratio of gas supplied to the chamber or chambers to fuel oil, and the third solenoid valve being pulsable in co-operation therewith to maintain said mimicking.
Claim 17
Dependent Claim
518 words
A dual-fuel oil injection engine adapted for selective running on the fuel oil as the sole fuel in a single-fuel mode or on fuel oil and on gas simultaneously in a dual-fuel mode, said engine comprising a circulatory fuel oil supply system, pump means to circulate the fuel oil around the supply system, a governor control drivable from a moving part of the engine and connected in said fuel oil supply system upstream of a throttle control which is in turn upstream of a first solenoid valve which is in turn upstream of a metering device for metering the amount of fuel oil injected into one or more combustion chambers of the engine, the arrangement being such that on operation of said first solenoid valve fuel oil is capable of being supplied to the metering device under pressure which is a function of the governor control speed and of the throttle control setting, the amount of fuel oil injected into said combustion chamber or chambers being dependent upon said pressure and upon engine speed during the single-fuel mode of the engine, the engine further comprising a by-pass line in the circulatory fuel oil supply system, said by-pass line being connected downstream of the throttle control but upstream of the first solenoid valve, and downstream of the first solenoid valve and upstream of the metering device, in order to allow fuel to flow through the by-pass line by-passing the first solenoid valve when said first solenoid valve is shut-off and when a second solenoid valve in the by-pass line is operative while running the engine in its dual-fuel mode, the engine further comprising a reference supply line connected downstream of the throttle control and downstream of the metering device, a third solenoid valve being provided in the reference supply line, said second and third solenoid valves providing variable flow restrictors and being electrically pulsable in co-operative manner, the third solenoid valve providing metering device mimic means which in use in the dual-fuel mode is effective to produce mimicking of the pressure conditions set up by the metering device in the single-fuel mode, and the reference supply line being connected to sensor means responsive to the pressure in the reference supply line to thereby control the amount of gas supplied to said combustion chamber or chambers, when said third solenoid valve is operative during the dual-fuel mode, for ignition by fuel oil injected by way of the by-pass line when the second solenoid valve is operative and through the metering device, the arrangement being such that in the single-fuel mode the first solenoid valve is operative with the second and third solenoid valves shut off, and during the dual-fuel mode the engine operates with the first solenoid valve shut off and the second and third solenoid valves operative, the second solenoid valve being pulsable to allow a variable amount of fuel oil to be injected into said combustion chamber or chambers to vary the ratio of gas supplied to the chamber or chambers to fuel oil, and the third solenoid valve being pulsable in co-operation therewith to maintain said mimicking.
Claim 18
Independent Claim
389 words
A method of adapting a diesel engine to run as a dual-fuel engine, said diesel engine being of a type which has a circulatory fuel oil injection supply system, for example a "Cummins" diesel engine having a "PT" fuel injection system, said diesel engine further being of a type having an engine driven governor control arranged to vary the pressure in the circulatory fuel oil injection supply system in accordance with engine speed, said governor control being connected into the circulatory system upstream of a throttle control and a first valve means, said first valve means being operative to allow fuel oil to be supplied under pressure to a metering device of the engine which injects fuel oil into a combustion chamber or chambers of the engine, and said pressure being a function of the engine speed (by way of the governor control) and of the throttle setting so that the greater the throttle setting the more fuel oil is injected into the combustion chamber or chambers, said method comprising: a) installing a by-pass line and second valve means in the circulatory supply system so that with the first valve means shut-off and with the second valve means operative fuel oil can by-pass the first valve means to the metering device of the engine; b) installing a reference supply line downstream of the throttle control and upstream of the first valve means and installing third valve means providing metering device mimic means which, during dual-fuel operation of the engine, is effective to mimic the varying pressure conditions developed at the metering device which previously would have taken place while running the diesel engine before adaptation to a dual-fuel engine, said second valve means providing a variable flow restrictor and being electrically pulsable to vary the amount of fuel oil fed to said combustion chamber or chambers and said third valve means also providing a variable restrictor and being pulsable in co-operation with said second valve means; c) connecting the diesel engine to a gas supply through gas supply control means arranged to be responsive to the pressure developed in the reference supply line in the dual-fuel mode thereby to control the amount of gas fed to the combustion chamber or chambers for ignition by the fuel oil injected therein so that the diesel engine runs as a dual-fuel engine.
Claim 19
Independent Claim
389 words
A method of adapting a diesel engine to run as a dual-fuel engine, said diesel engine being of a type which has a circulatory fuel oil injection supply system, for example a "Cummins" diesel engine having a "PT" fuel injection system, said diesel engine further being of a type having an engine driven governor control arranged to vary the pressure in the circulatory fuel oil injection supply system in accordance with engine speed, said governor control being connected into the circulatory system upstream of a throttle control and a first valve means, said first valve means being operative to allow fuel oil to be supplied under pressure to a metering device of the engine which injects fuel oil into a combustion chamber or chambers of the engine, and said pressure being a function of the engine speed (by way of the governor control) and of the throttle setting so that the greater the throttle setting the more fuel oil is injected into the combustion chamber or chambers, said method comprising: a) installing a by-pass line and second valve means in the circulatory supply system so that with the first valve means shut-off and with the second valve means operative fuel oil can by-pass the first valve means to the metering device of the engine; b) installing a reference supply line downstream of the throttle control and upstream of the first valve means and installing third valve means providing metering device mimic means which, during dual-fuel operation of the engine, is effective to mimic the varying pressure conditions developed at the metering device which previously would have taken place while running the diesel engine before adaptation to a dual-fuel engine, said second valve means providing a variable flow restrictor and being electrically pulsable to vary the amount of fuel oil fed to said combustion chamber or chambers and said third valve means also providing a variable restrictor and being pulsable in co-operation with said second valve means; c) connecting the diesel engine to a gas supply through gas supply control means arranged to be responsive to the pressure developed in the reference supply line in the dual-fuel mode thereby to control the amount of gas fed to the combustion chamber or chambers for ignition by the fuel oil injected therein so that the diesel engine runs as a dual-fuel engine.
Claim 20
Independent Claim
216 words
A method of adapting a single-fuel mode fuel oil injection engine in which the amount of fuel oil injected into the engine varies with the pressure in a fuel oil supply line of a fuel oil circulatory system which includes a shut-off valve, said pressure varying in accordance with a throttle control setting and the fuel oil being injected by way of a metering device which meters different amounts of fuel oil into a combustion chamber or chamber of the engine in accordance with the pressure in the supply line, said method comprising adapting the engine to run in a dual-fuel mode by providing bypass means to allow the fuel oil to bypass the shut-off valve, and connecting a reference supply into the circulatory system which is arranged to produce a close mimicking in the dual-fuel mode of the effect of the fluid flow pressure constraints caused by the metering device in the single-fuel mode, and utilizing the pressure in the reference supply line to control the amount of gas supplied to the combustion chamber or chambers for ignition by pilot shots of fuel oil fed by way of the metering device into said chamber or chambers and by way of said bypass means so that the engine is adapted to run in a dual-fuel mode.
Claim 21
Independent Claim
216 words
A method of adapting a single-fuel mode fuel oil injection engine in which the amount of fuel oil injected into the engine varies with the pressure in a fuel oil supply line of a fuel oil circulatory system which includes a shut-off valve, said pressure varying in accordance with a throttle control setting and the fuel oil being injected by way of a metering device which meters different amounts of fuel oil into a combustion chamber or chamber of the engine in accordance with the pressure in the supply line, said method comprising adapting the engine to run in a dual-fuel mode by providing bypass means to allow the fuel oil to bypass the shut-off valve, and connecting a reference supply into the circulatory system which is arranged to produce a close mimicking in the dual-fuel mode of the effect of the fluid flow pressure constraints caused by the metering device in the single-fuel mode, and utilizing the pressure in the reference supply line to control the amount of gas supplied to the combustion chamber or chambers for ignition by pilot shots of fuel oil fed by way of the metering device into said chamber or chambers and by way of said bypass means so that the engine is adapted to run in a dual-fuel mode.
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