CA1292920C - Diesel engine secondary fuel injection system - Google Patents
Diesel engine secondary fuel injection systemInfo
- Publication number
- CA1292920C CA1292920C CA 590988 CA590988A CA1292920C CA 1292920 C CA1292920 C CA 1292920C CA 590988 CA590988 CA 590988 CA 590988 A CA590988 A CA 590988A CA 1292920 C CA1292920 C CA 1292920C
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- Canada
- Prior art keywords
- engine
- pressure
- turbo
- fuel
- diesel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
DIESEL ENGINE SECONDARY FUEL INJECTION SYSTEM
ABSTRACT OF THE DISCLOSURE
A method of operating a diesel engine. Diesel fuel is controllably injected into the engine. An engine performance parameter such as turbo-charger boost pressure, fuel pressure in the diesel fuel injector galleries, or air intake manifold pressure, or a combination of such parameters, is monitored. A
secondary fuel such as propane is injected into the engine in an amount which varies as a function of the monitored parameter(s).
ABSTRACT OF THE DISCLOSURE
A method of operating a diesel engine. Diesel fuel is controllably injected into the engine. An engine performance parameter such as turbo-charger boost pressure, fuel pressure in the diesel fuel injector galleries, or air intake manifold pressure, or a combination of such parameters, is monitored. A
secondary fuel such as propane is injected into the engine in an amount which varies as a function of the monitored parameter(s).
Description
DIESEL ENGINE SECONDARY FUEL INJECTION ~YSTEM
FIELD OF THE INVENTION
This application pertains to a method of economically operating a diesel engine by fueling the engine with a mixture of diesel fuel and a secondary fuel such as propane, the relative amounts of diesel and secondary fuels being controllably varied as a function of various operating parameters.
BACKGROUND OF THE INVENTION
Diesel engine fuel systems which utilize diesel fuel as the primary fuel and a secondary fuel such as propane are well known. Conventionally, dual fuel systems of this sort are employed to increase the horsepower output by the diesel engine.
As a general rule, it is undesirable to operate a diesel engine in excess of the maximum ratsd horsepower specified by the engine manufacturer, since this may cause damage to the engine and/or void the manufa¢turer's warranty coverage for the engine. Dual fuel ~ystems are nevertheless desirable in that the price of the secondary fuel is typically less than the price of the primary diesel fuel. If a diesel engine can be operated efficiently and within the manufacturer's specifications with a dual fuel system, then significant cost savings may be realized over extended operating cycles when the combined cost of the primary and secondary fuels are taken into account. ~he present invention is directed to a method of economically operating a dual fuel diesel engine in a manner which optimizes the engine's per-formance by continually varying the relative amounts of primary and secondary fuel injected into the engine, as a ~unction of one or more performance parameters, whilst adhering to the manu-facturer's specifications for operating the engine.
SUMMARY OF THE INVENTION
In accordance with a basic, preferred embodiment, the invention provides a method of operating a turbo-charged diesel engine by controllably injecting pressurized diesel fuel into the engine, monitoring the boost pressure output by the engine's turbo-charger, and controllably injecting a secondary fuel such as propane into the engine in an amount which varies as a function of the monitored turbo-charger boost pressure.
Advantageously, a plurality of pressure sensors are coupled to the engine's turbo-charger. The sensors output electrical signals representative of the turbo-charger's boost pressure. An equal plurality of normally closed valves are coupled between the engine and a secondary fuel reservoir. The valves are each openable in response to an applied signal. Each sensor is adjusted to detect a selected turbo-charger boost pressure within a pre-defined pressure range. Accordingly, each sensor produces an output signal when the turbo-charger output increases to that selected pressure. The plurality of sensors together produce a plurality of output signals distributed within the pre-defined pressure range. The output signals are applied to corresponding ones of the valves, thus opening the valves in sequence as the turbo-charger boost pressure increases, and admitting a progressively increasing amount of the secondary fuel to the engine.
In accordance with a second aspect, the invention provides a method of operating a diesel engine by controllably injecting pressurized diesel fuel into the engine, monitoring the pressure of the liquid diesel fuel supplied to the fuel injectors, and controllably injecting a secondary fuel such as propane into the engine in an amount which varies as a function of the monitored diesel fuel pressure.
The first and second aspects of the invention may be combined by controllably injecting the secondary fuel into the `` ` lZ~Z9~0 engine in an amount which varies as a function of both the monitored diesel fuel pressure and the monitored turbo-charger boost pressure.
In accordance with a third aspect, the invention provides a method of operating a diesel engine powered liquid pump by controllably injecting pressurized diesel fuel into the engine, monitoring the hydraulic pressure of the pumped liquid, and controllably injecting a secondary fuel such as propane into the engine in an amount which varies as a function of the monitored hydraulic pressure.
In accordance with a fourth aspect, the invention provides a method of operating a diesel engine powered electric generator by controllably injecting pressurized diesel fuel into the engine, monitoring the electric current output by the generator, and controllably injecting a secondary fuel such as propane into the engine in an amount which varies as a function o~ the monitored current. If the diesel engine which powers the electric generator is equipped with a turbo-charger, then the secondary fuel may be injected into the engine in an amount which varies as a function of both the current output by the generator and the turbo-charger boost pressure.
In accordance with a fifth aspect, the invention provides a method of operating a diesel engine powered gas compressor by controllably injecting pressurized diesel fuel into the engine, monitoring the pressure of the compressed gas output by the compressor, and controllably injecting a secondary fuel such as propane into the engine in an amount which varies as a function of the monitored pressure.
In accordance with a sixth aspect, the invention provides a method of operating a diesel engine having an air intake manifold by controllably injecting pressurized diesel fuel into the engine, monitoring the air pressure within the manifold, and controllably injecting a secondary fuel such as propane into tZ~
the engine in an amount which varies as a function of the monitored air intake manifold pressure.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a block diagram of the basic components of a diesel engine propane injection system according to the invention.
Figure 2 is a pictorial illustration of a fuel nozzle ring for injecting propane into the air intake of a diesel engine turbo-charger.
DETAILED DESCRIPTION OF THE PREFERRED EMBODINENT
Figure 1 is a block diagram which illustrates the basic components of a diesel engine propane injection system constructed in accordance with the preferred embodiment of the invention. A suitable secondary fuel such as compressed propane which is stored in tank 1 and ls supplied~ through electric lock-off device 2, vaporizer/regulator valve 3 and fuel line 4 to fuel nozzle ring 15. Fuel nozzle ring 15 is mounted in air intake pipe 11, which delivers air from the engine's air cleaner (not shown) to turbo-charger 12 mounted on diesel engine 10. Nozzle ring 15 incorporates a plurality of fuel nozzles 8 which regulate the amount of propane injected into air intake pipe 11.
One or more normally closed solenoid actuated valves 9 are provided on fuel nozzle ring 15. Propane supplied via line 4 is distributed by flow divider 7 into a number of separate lines, one coupled to each of valves 9. The outputs of each of valves 9 are coupled to one or more of injector nozzles 8. The number of valves required will vary from one application to another, depending upon the amount of propane required for injection into air intake pipe 11.
z~
The boost pressure output by turbo-charger 12 is detected by each one of a plurality of normally open pressure sensitive switches 5. Switches 5 are coupled to air crossover 13 via hose 14. Each of switches 5 is adjusted to detect a selected turbo-charger boost pressure falling within a pre-defi:ned turbo-charger boost pressure range. As the turbo-charger boost pressure increases to the pressure which a particular one of switches 5 has been adjusted to detect, that switch closes, thereby producing an output signal which is conveyed to a lo corresponding one of solenoid actuated valves 9 along one of wires 6. It will thus be understood that, by adjusting each of switches 5 to detect progressively increasing turbo-charger boost pressures, the full complement of switches will together produce a plurality of output signals distributed within the pre-defined turbo-charger boost pressure range.
In operation, as the turbo-charger boost pressure increases within the pre-defined range for which switches 5 have been adjusted, the switches close in sequence, applying their re~pective output signals to corresponding ones of valves 9.
Application of an output signal to one of valves 9 causes that valve to open, thereby admitting propane to the nozzle(s) to which that valve is coupled, causing propane to be injected into air intake pipe 11 for delivery to engine 10. As the turbo-charger boost pressure continues to increase, addi~ional switchesclose, producing further output signals which in turn open additional valves, causing further propane to be injected into air intake pipe 11 and engine 10. If the turbo-charger boost pressure increases above the pressure detected by the switch adjusted to the highest pressure setting, then all of switches 5 will be closed and all of valves 9 will be open, admitting the maximum amount of propane into air intake pipe 11 and engine 10.
If the turbo-charger boost pressure decreases below the pressure detected by the switch having the highest pressure setting, then that switch will re-open and it will no longer supply an output signal to one of valves 9. The valve to which that switch is connected will accordingly close, decreasing the amount of -` 12~?Z~O
propane injected into air intake pipe ll and engine lO. If the turbo-charger boost pressure continues to decrease below the pressure settings of the other switches, then those switches will also re-open, causing their corresponding valYes to close and further reducing the amount of propane injected into air intake pipe ll and engine lO until no propane is injected into air intake pipe ll. Propane injection via sequential opening and closing of valves 9 assists in maintaining a proper air/fuel mixture throughout the operating range of engine 10, which in turn enhances fuel economy, engine efficiency and pollution control.
Those skilled in the art will appreciate that although the invention has been described in the context of a diesel engine equipped with a turbo-charger, non turbo-charged engines may also benefit from the invention. For example, instead of using switches 5 to monitor the turbo-charger boost pressure, one may instead couple switches 5 to the fuel galleries which supply diesel fuel to the engine's fuel injectors so that the switches e~fectively monitor the fuel pressure within the fuel gallery.
By adjusting the switches to close at selected pressures distributed within a pre-defined fuel pressure range, one may controllably inject propane into engine 10 in an amount which varies as a function of the monitored diesel fuel pressure.
Similarly, the operation of a diesel engine may be controlled by monitoring the air preRsure within the engine's air intake manifold with a bank of switches like those described above in relation to Figure 1. The output signals produced by the switches can then be used to control the injection of propane into the engine in an amount which varies as a function of the monitored air intake manifold pressure.
Those skilled in the art will further appreciate that additional control over the operating characteristics of the engine may be attained by controlling propane injection as a function of more than one operating parameter. For example, in the case of a turbo-charged diesel engine, one may employ two 21~
separate banks of switches; the first bank being adapted to monitor the boost pressure of the engine turbo-charger as discllssed above in relation to Figure l; the second bank being adapted to monitor the fuel pressure within the fuel injector galleries as just described. Propane may then be controllably injected into the engine in an amount which varies as a function of both the monitored diesel fuel pressure and the monitored turbo-charger boost pressure, by coupling one of the turbo-charger boost switches and one of the fuel pressure sensors to a single propane injector valve.
The invention may also be adapted to control the operation of a variety of diesel engine powered devices for maximum fuel economy. For example, to control the operation of a diesel engine powered liquid pump, one may use a bank of switches like those described above in relation to Figure 1 to monitor the hydraulic pressure of the pumped liquid and control-lably inject propane into the engine in an amount which varies as a function of the monitored hydraulic pressure. Similarly, in the case o~ a diesel engine powered electric generator, one may employ a bank of switches to monitor the electric current output by the generator and controllably inject propane into the engine in an amount which varies as a function of the monitored current. The operation of a diesel engine powered gas compressor may be similarly controlled by monitoring the pressure of the compressed gas and controllably injecting propane into the engine in an amount which varies as a function of the monitored gas pressure.
As will be apparent to those skilled in the art in the light of the foregoing disclosure, many alterations and modifications are possible in the practice of this invention without departing from the spirit or scope thereof. Accordingly, the scope of the invention is to be construed in accordance with the substance defined by the following claims.
FIELD OF THE INVENTION
This application pertains to a method of economically operating a diesel engine by fueling the engine with a mixture of diesel fuel and a secondary fuel such as propane, the relative amounts of diesel and secondary fuels being controllably varied as a function of various operating parameters.
BACKGROUND OF THE INVENTION
Diesel engine fuel systems which utilize diesel fuel as the primary fuel and a secondary fuel such as propane are well known. Conventionally, dual fuel systems of this sort are employed to increase the horsepower output by the diesel engine.
As a general rule, it is undesirable to operate a diesel engine in excess of the maximum ratsd horsepower specified by the engine manufacturer, since this may cause damage to the engine and/or void the manufa¢turer's warranty coverage for the engine. Dual fuel ~ystems are nevertheless desirable in that the price of the secondary fuel is typically less than the price of the primary diesel fuel. If a diesel engine can be operated efficiently and within the manufacturer's specifications with a dual fuel system, then significant cost savings may be realized over extended operating cycles when the combined cost of the primary and secondary fuels are taken into account. ~he present invention is directed to a method of economically operating a dual fuel diesel engine in a manner which optimizes the engine's per-formance by continually varying the relative amounts of primary and secondary fuel injected into the engine, as a ~unction of one or more performance parameters, whilst adhering to the manu-facturer's specifications for operating the engine.
SUMMARY OF THE INVENTION
In accordance with a basic, preferred embodiment, the invention provides a method of operating a turbo-charged diesel engine by controllably injecting pressurized diesel fuel into the engine, monitoring the boost pressure output by the engine's turbo-charger, and controllably injecting a secondary fuel such as propane into the engine in an amount which varies as a function of the monitored turbo-charger boost pressure.
Advantageously, a plurality of pressure sensors are coupled to the engine's turbo-charger. The sensors output electrical signals representative of the turbo-charger's boost pressure. An equal plurality of normally closed valves are coupled between the engine and a secondary fuel reservoir. The valves are each openable in response to an applied signal. Each sensor is adjusted to detect a selected turbo-charger boost pressure within a pre-defined pressure range. Accordingly, each sensor produces an output signal when the turbo-charger output increases to that selected pressure. The plurality of sensors together produce a plurality of output signals distributed within the pre-defined pressure range. The output signals are applied to corresponding ones of the valves, thus opening the valves in sequence as the turbo-charger boost pressure increases, and admitting a progressively increasing amount of the secondary fuel to the engine.
In accordance with a second aspect, the invention provides a method of operating a diesel engine by controllably injecting pressurized diesel fuel into the engine, monitoring the pressure of the liquid diesel fuel supplied to the fuel injectors, and controllably injecting a secondary fuel such as propane into the engine in an amount which varies as a function of the monitored diesel fuel pressure.
The first and second aspects of the invention may be combined by controllably injecting the secondary fuel into the `` ` lZ~Z9~0 engine in an amount which varies as a function of both the monitored diesel fuel pressure and the monitored turbo-charger boost pressure.
In accordance with a third aspect, the invention provides a method of operating a diesel engine powered liquid pump by controllably injecting pressurized diesel fuel into the engine, monitoring the hydraulic pressure of the pumped liquid, and controllably injecting a secondary fuel such as propane into the engine in an amount which varies as a function of the monitored hydraulic pressure.
In accordance with a fourth aspect, the invention provides a method of operating a diesel engine powered electric generator by controllably injecting pressurized diesel fuel into the engine, monitoring the electric current output by the generator, and controllably injecting a secondary fuel such as propane into the engine in an amount which varies as a function o~ the monitored current. If the diesel engine which powers the electric generator is equipped with a turbo-charger, then the secondary fuel may be injected into the engine in an amount which varies as a function of both the current output by the generator and the turbo-charger boost pressure.
In accordance with a fifth aspect, the invention provides a method of operating a diesel engine powered gas compressor by controllably injecting pressurized diesel fuel into the engine, monitoring the pressure of the compressed gas output by the compressor, and controllably injecting a secondary fuel such as propane into the engine in an amount which varies as a function of the monitored pressure.
In accordance with a sixth aspect, the invention provides a method of operating a diesel engine having an air intake manifold by controllably injecting pressurized diesel fuel into the engine, monitoring the air pressure within the manifold, and controllably injecting a secondary fuel such as propane into tZ~
the engine in an amount which varies as a function of the monitored air intake manifold pressure.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a block diagram of the basic components of a diesel engine propane injection system according to the invention.
Figure 2 is a pictorial illustration of a fuel nozzle ring for injecting propane into the air intake of a diesel engine turbo-charger.
DETAILED DESCRIPTION OF THE PREFERRED EMBODINENT
Figure 1 is a block diagram which illustrates the basic components of a diesel engine propane injection system constructed in accordance with the preferred embodiment of the invention. A suitable secondary fuel such as compressed propane which is stored in tank 1 and ls supplied~ through electric lock-off device 2, vaporizer/regulator valve 3 and fuel line 4 to fuel nozzle ring 15. Fuel nozzle ring 15 is mounted in air intake pipe 11, which delivers air from the engine's air cleaner (not shown) to turbo-charger 12 mounted on diesel engine 10. Nozzle ring 15 incorporates a plurality of fuel nozzles 8 which regulate the amount of propane injected into air intake pipe 11.
One or more normally closed solenoid actuated valves 9 are provided on fuel nozzle ring 15. Propane supplied via line 4 is distributed by flow divider 7 into a number of separate lines, one coupled to each of valves 9. The outputs of each of valves 9 are coupled to one or more of injector nozzles 8. The number of valves required will vary from one application to another, depending upon the amount of propane required for injection into air intake pipe 11.
z~
The boost pressure output by turbo-charger 12 is detected by each one of a plurality of normally open pressure sensitive switches 5. Switches 5 are coupled to air crossover 13 via hose 14. Each of switches 5 is adjusted to detect a selected turbo-charger boost pressure falling within a pre-defi:ned turbo-charger boost pressure range. As the turbo-charger boost pressure increases to the pressure which a particular one of switches 5 has been adjusted to detect, that switch closes, thereby producing an output signal which is conveyed to a lo corresponding one of solenoid actuated valves 9 along one of wires 6. It will thus be understood that, by adjusting each of switches 5 to detect progressively increasing turbo-charger boost pressures, the full complement of switches will together produce a plurality of output signals distributed within the pre-defined turbo-charger boost pressure range.
In operation, as the turbo-charger boost pressure increases within the pre-defined range for which switches 5 have been adjusted, the switches close in sequence, applying their re~pective output signals to corresponding ones of valves 9.
Application of an output signal to one of valves 9 causes that valve to open, thereby admitting propane to the nozzle(s) to which that valve is coupled, causing propane to be injected into air intake pipe 11 for delivery to engine 10. As the turbo-charger boost pressure continues to increase, addi~ional switchesclose, producing further output signals which in turn open additional valves, causing further propane to be injected into air intake pipe 11 and engine 10. If the turbo-charger boost pressure increases above the pressure detected by the switch adjusted to the highest pressure setting, then all of switches 5 will be closed and all of valves 9 will be open, admitting the maximum amount of propane into air intake pipe 11 and engine 10.
If the turbo-charger boost pressure decreases below the pressure detected by the switch having the highest pressure setting, then that switch will re-open and it will no longer supply an output signal to one of valves 9. The valve to which that switch is connected will accordingly close, decreasing the amount of -` 12~?Z~O
propane injected into air intake pipe ll and engine lO. If the turbo-charger boost pressure continues to decrease below the pressure settings of the other switches, then those switches will also re-open, causing their corresponding valYes to close and further reducing the amount of propane injected into air intake pipe ll and engine lO until no propane is injected into air intake pipe ll. Propane injection via sequential opening and closing of valves 9 assists in maintaining a proper air/fuel mixture throughout the operating range of engine 10, which in turn enhances fuel economy, engine efficiency and pollution control.
Those skilled in the art will appreciate that although the invention has been described in the context of a diesel engine equipped with a turbo-charger, non turbo-charged engines may also benefit from the invention. For example, instead of using switches 5 to monitor the turbo-charger boost pressure, one may instead couple switches 5 to the fuel galleries which supply diesel fuel to the engine's fuel injectors so that the switches e~fectively monitor the fuel pressure within the fuel gallery.
By adjusting the switches to close at selected pressures distributed within a pre-defined fuel pressure range, one may controllably inject propane into engine 10 in an amount which varies as a function of the monitored diesel fuel pressure.
Similarly, the operation of a diesel engine may be controlled by monitoring the air preRsure within the engine's air intake manifold with a bank of switches like those described above in relation to Figure 1. The output signals produced by the switches can then be used to control the injection of propane into the engine in an amount which varies as a function of the monitored air intake manifold pressure.
Those skilled in the art will further appreciate that additional control over the operating characteristics of the engine may be attained by controlling propane injection as a function of more than one operating parameter. For example, in the case of a turbo-charged diesel engine, one may employ two 21~
separate banks of switches; the first bank being adapted to monitor the boost pressure of the engine turbo-charger as discllssed above in relation to Figure l; the second bank being adapted to monitor the fuel pressure within the fuel injector galleries as just described. Propane may then be controllably injected into the engine in an amount which varies as a function of both the monitored diesel fuel pressure and the monitored turbo-charger boost pressure, by coupling one of the turbo-charger boost switches and one of the fuel pressure sensors to a single propane injector valve.
The invention may also be adapted to control the operation of a variety of diesel engine powered devices for maximum fuel economy. For example, to control the operation of a diesel engine powered liquid pump, one may use a bank of switches like those described above in relation to Figure 1 to monitor the hydraulic pressure of the pumped liquid and control-lably inject propane into the engine in an amount which varies as a function of the monitored hydraulic pressure. Similarly, in the case o~ a diesel engine powered electric generator, one may employ a bank of switches to monitor the electric current output by the generator and controllably inject propane into the engine in an amount which varies as a function of the monitored current. The operation of a diesel engine powered gas compressor may be similarly controlled by monitoring the pressure of the compressed gas and controllably injecting propane into the engine in an amount which varies as a function of the monitored gas pressure.
As will be apparent to those skilled in the art in the light of the foregoing disclosure, many alterations and modifications are possible in the practice of this invention without departing from the spirit or scope thereof. Accordingly, the scope of the invention is to be construed in accordance with the substance defined by the following claims.
Claims (11)
1. A method of operating a turbo-charged diesel engine, com-prising the steps of:
(a) controllably injecting pressurized diesel fuel into said engine;
(b) monitoring the boost pressure of said engine turbo-charger; and, (c) controllably injecting a secondary fuel into said engine in an amount which varies as a function of said monitored turbo-charger boost pressure.
(a) controllably injecting pressurized diesel fuel into said engine;
(b) monitoring the boost pressure of said engine turbo-charger; and, (c) controllably injecting a secondary fuel into said engine in an amount which varies as a function of said monitored turbo-charger boost pressure.
2. A method of operating a diesel engine, comprising the steps of:
(a) controllably injecting pressurized diesel fuel into said engine;
(b) monitoring the pressure of said diesel fuel; and, (c) controllably injecting a secondary fuel into said engine in an amount which varies as a function of said monitored diesel fuel pressure.
(a) controllably injecting pressurized diesel fuel into said engine;
(b) monitoring the pressure of said diesel fuel; and, (c) controllably injecting a secondary fuel into said engine in an amount which varies as a function of said monitored diesel fuel pressure.
3. A method of operating a diesel engine powered liquid pump, comprising the steps of:
(a) controllably injecting pressurized diesel fuel into said engine;
(b) monitoring the hydraulic pressure of said pumped liquid; and, (c) controllably injecting a secondary fuel into said engine in an amount which varies as a function of said monitored hydraulic pressure.
(a) controllably injecting pressurized diesel fuel into said engine;
(b) monitoring the hydraulic pressure of said pumped liquid; and, (c) controllably injecting a secondary fuel into said engine in an amount which varies as a function of said monitored hydraulic pressure.
4. A method of operating a diesel engine powered electric generator, comprising the steps of:
(a) controllably injecting pressurized diesel fuel into said engine;
(b) monitoring the electric current output by said generator; and, (c) controllably injecting a secondary fuel into said engine in an amount which varies as a function of said monitored current.
(a) controllably injecting pressurized diesel fuel into said engine;
(b) monitoring the electric current output by said generator; and, (c) controllably injecting a secondary fuel into said engine in an amount which varies as a function of said monitored current.
5. A method of operating a diesel engine powered gas compres-sor, comprising the steps of:
(a) controllably injecting pressurized diesel fuel into said engine;
(b) monitoring the pressure of said compressed gas;
and, (c) controllably injecting a secondary fuel into said engine in an amount which varies as a function of said monitored pressure.
(a) controllably injecting pressurized diesel fuel into said engine;
(b) monitoring the pressure of said compressed gas;
and, (c) controllably injecting a secondary fuel into said engine in an amount which varies as a function of said monitored pressure.
6. A method of operating a diesel engine having an air intake manifold, said method comprising the steps of:
(a) controllably injecting pressurized diesel fuel into said engine;
(b) monitoring the air pressure within said manifold;
and, (c) controllably injecting a secondary fuel into said engine in an amount which varies as a function of said monitored air intake manifold pressure.
(a) controllably injecting pressurized diesel fuel into said engine;
(b) monitoring the air pressure within said manifold;
and, (c) controllably injecting a secondary fuel into said engine in an amount which varies as a function of said monitored air intake manifold pressure.
7. A method of operating a turbo-charged diesel engine, com-prising the steps of:
(a) controllably injecting pressurized diesel fuel into said engine;
(b) monitoring the pressure of said diesel fuel;
(c) monitoring the boost pressure of said engine turbo-charger; and, (d) controllably injecting a secondary fuel into said engine in an amount which varies as a function of:
(i) said monitored diesel fuel pressure; and, (ii) said monitored turbo-charger boost pressure.
(a) controllably injecting pressurized diesel fuel into said engine;
(b) monitoring the pressure of said diesel fuel;
(c) monitoring the boost pressure of said engine turbo-charger; and, (d) controllably injecting a secondary fuel into said engine in an amount which varies as a function of:
(i) said monitored diesel fuel pressure; and, (ii) said monitored turbo-charger boost pressure.
8. A method as defined in claims 1 or 7, further comprising:
(a) coupling a plurality of pressure sensors to said engine turbo-charger, said sensors for sensing the boost pressure output of said engine turbo-charg-er;
(b) coupling an equal plurality of normally closed valves between said engine and a propane reser-voir, said valves being openable in response to an applied signal;
(c) adjusting each of said sensors to detect a select-ed turbo-charger boost pressure within a pressure range, such that each of said sensors produces an output signal when said engine turbo-charger boost pressure is increased to said corresponding selected boost pressure, and such that said plurality of sensors together produce a plurality of output signals distributed within said pressure range; and, (d) applying said output signals to corresponding ones of said valves.
(a) coupling a plurality of pressure sensors to said engine turbo-charger, said sensors for sensing the boost pressure output of said engine turbo-charg-er;
(b) coupling an equal plurality of normally closed valves between said engine and a propane reser-voir, said valves being openable in response to an applied signal;
(c) adjusting each of said sensors to detect a select-ed turbo-charger boost pressure within a pressure range, such that each of said sensors produces an output signal when said engine turbo-charger boost pressure is increased to said corresponding selected boost pressure, and such that said plurality of sensors together produce a plurality of output signals distributed within said pressure range; and, (d) applying said output signals to corresponding ones of said valves.
9. A method as defined in claims 2 or 7, further comprising:
(a) coupling a plurality of pressure sensors into said engine's pressurized diesel fuel supply line;
(b) coupling an equal plurality of normally closed valves between said engine and a propane reser-voir, said valves being openable in response to an applied signal;
(c) adjusting each of said sensors to detect a select-ed diesel fuel pressure within a pressure range, such that each of said sensors produces an output signal representative of said corresponding selected pressure when said diesel fuel pressure is increased to said corresponding selected pressure, and such that said plurality of sensors together produce a plurality of output signals distributed within said pressure range; and, (d) applying said output signals to corresponding ones of said valves.
(a) coupling a plurality of pressure sensors into said engine's pressurized diesel fuel supply line;
(b) coupling an equal plurality of normally closed valves between said engine and a propane reser-voir, said valves being openable in response to an applied signal;
(c) adjusting each of said sensors to detect a select-ed diesel fuel pressure within a pressure range, such that each of said sensors produces an output signal representative of said corresponding selected pressure when said diesel fuel pressure is increased to said corresponding selected pressure, and such that said plurality of sensors together produce a plurality of output signals distributed within said pressure range; and, (d) applying said output signals to corresponding ones of said valves.
10. A method as defined in claim 1, 2 or 3, wherein said secondary fuel is propane.
11. A method of operating a turbo-charged diesel engine powered electric generator, comprising the steps of:
(a) controllably injecting pressurized diesel fuel into said engine;
(b) monitoring the electric current output by said generator;
(c) monitoring the boost pressure of said engine turbo-charger; and, (d) controllably injecting a secondary fuel into said engine in an amount which varies as a function of:
(i) said monitored current; and, (ii) said monitored turbo-charger boost pressure.
(a) controllably injecting pressurized diesel fuel into said engine;
(b) monitoring the electric current output by said generator;
(c) monitoring the boost pressure of said engine turbo-charger; and, (d) controllably injecting a secondary fuel into said engine in an amount which varies as a function of:
(i) said monitored current; and, (ii) said monitored turbo-charger boost pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 590988 CA1292920C (en) | 1989-02-14 | 1989-02-14 | Diesel engine secondary fuel injection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 590988 CA1292920C (en) | 1989-02-14 | 1989-02-14 | Diesel engine secondary fuel injection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1292920C true CA1292920C (en) | 1991-12-10 |
Family
ID=4139618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 590988 Expired CA1292920C (en) | 1989-02-14 | 1989-02-14 | Diesel engine secondary fuel injection system |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1292920C (en) |
-
1989
- 1989-02-14 CA CA 590988 patent/CA1292920C/en not_active Expired
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