Two-cycle engine with fuel injection
AssigneeBrunswick Corporation
InventorRichard E. Staerzl
Life of this patent
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Abstract
The invention contemplates electronically controlled fuel-injection for a multiple-cylinder two-cycle internal-combustion engine wherein each cylinder has its own independent crankcase region in which to receive and compress inlet air and fuel, prior to delivery of combustible mixture to the head or combustion end of the cylinder. Fuel is injected into each crankcase region during only a portion of the stroke involving induced intake of air therein, i.e., during only a portion of the rise of each piston in its approach to top-center position, and while pressure within the crankcase region is relatively uniform. The time-duration of actual injection is relatively short, thus enabling a plurality of different cylinder injections to be made concurrently, resulting in simplification of fuel-injection control circuitry.
Claims19
In a two-cycle six-cylinder internal combustion engine, each cylinder having an associated crankcase with a gas-flow inlet including a check valve, and each cylinder having an exhaust outlet exclusive of the associated crankcase region, means operating in timed relation with a piston in each cylinder for admitting to the associated combustion region gas compressed in the associated crankcase region, an electrically operable fuel-injection device associated with each cylinder for injecting fuel into the crankcase region of that cylinder, ignition means associated with each cylinder and successively operative substantially at the top-center condition of the piston in each cylinder, first fuel-injection signal-generator means producing a first control-signal output in response to the ignition function in one of said cylinders, second fuel-injection signal-generator means producing a second control-signal output in response to the ignition function in a second cylinder whose cycle is 180-degrees phase-displaced from said one cylinder, the first control-signal output being connected to the fuel-injection device associated with said second cylinder and with the respective fuel-injection devices of the two cylinders whose cycles are respectively in 60 degrees and 120 degrees phase-lagging relation to said second cylinder, the second control-signal output being connected to the fuel-injection device associated with said one cylinder and with the respective fuel-injection devices of the two remaining cylinders.
In a two-cycle internal combustion engine having an even number of cylinders wherein the number is at least four, each cylinder having an associated crankcase with a gas-flow inlet including a check valve, and each cylinder having an exhaust outlet exclusive of the associated crankcase region, means operating in timed relation with a piston in each cylinder for admitting to the associated combustion region gas compressed in the associated crankcase region, an electrically operable fuel-injection device associated with each cylinder for injecting fuel into the crankcase region of that cylinder, ignition means associated with each cylinder and successively operative substantially at the top-center condition of the piston in each cylinder, first fuel-injection signal-generator means producing a first control-signal output in response to the ignition function in one of said cylinders, second fuel-injection signal-generator means producing a second control-signal output in response to the ignition function in a second cylinder whose cycle is 180-degrees phase-displaced from said one cylinder, the first control-signal output being connected to the fuel-injection device associated with said second cylinder and with the fuel-injection devices of such other cylinders whose cycles are in less than 180 degrees phase-lagging relation to said second cylinder, the second control-signal output being connected to the fuel-injection device associated with said one cylinder and with the respective fuel-injection devices of such other cylinders whose cycles are in less than 180 degrees phase-lagging relation to said one cylinder.
In a two-cycle six-cylinder internal combustion engine, each cylinder having an associated crankcase with a gas-flow inlet including a check valve, and each cylinder having an exhaust outlet exclusive of the associated crankcase region, means operating in timed relation with a piston in each cylinder for admitting to the associated combustion region gas compressed in the associated crankcase region, an electrically operable fuel-injection device associated with each cylinder for injecting fuel into the crankcase region of that cylinder, ignition means associated with each cylinder and successively operative substantially at the top-center condition of the piston in each cylinder, first fuel-injection signal-generator means producing a first control-signal output in response to the ignition function in one of said cylinders, second fuel-injection signal-generator means producing a second control-signal output in response to the ignition function in a second cylinder whose cycle is 120 degrees phase-lead displaced from said one cylinder, third fuel-injection signal-generator means producing a third control-signal output in response to the ignition function in a third cylinder whose cycle is 120-degrees phase-lead displaced from said second cylinder, the first control-signal output being connected to the fuel-injection devices associated with said second cylinder and with the cylinder whose cycle is in 60 degrees phase-leading relation to said second cylinder, the second control-signal output being connected to the fuel-injection devices associated with said third cylinder and with the cylinder whose cycle is in 60 degrees phase-leading relation to said third cylinder, and the third control-signal output being connected to the fuel-injection devices associated with said one cylinder and with the cylinder whose cycle is in 60 degrees phase-leading relation to said one cylinder.
In a two-cycle five-cylinder internal combustion engine, each cylinder having an associated crankcase with a gas-flow inlet including a check valve, and each cylinder having an exhaust outlet exclusive of the associated crankcase region, means operating in timed relation with a piston in each cylinder for admitting to the associated combustion region gas compressed in the associated crankcase region, an electrically operable fuel-injection device associated with each cylinder for injecting fuel into the crankcase region of that cylinder, ignition means associated with each cylinder and operative in one-two-three-four-five succession substantially at the top-center condition of the piston in each cylinder, first fuel-injection signal-generator means producing a first control-signal output in response to the ignition function in cylinder-one of said succession, second fuel-injection signal-generator means producing a second control-signal output in response to the ignition function in cylinder-three of said succession, the first control-signal output being connected to the fuel-injection devices associated with said cylinders two and three and four, the second control-signal output being connected to the fuel-injection devices associated with said cylinders five and one.
In a two-cycle five-cylinder internal combustion engine, each cylinder having an associated crankcase with a gas-flow inlet including a check valve, and each cylinder having an exhaust outlet exclusive of the associated crankcase region, means operating in timed relation with a piston in each cylinder for admitting to the associated combustion region gas compressed in the associated crankcase region, an electrically operable fuel-injection device associated with each cylinder for injecting fuel into the crankcase region of that cylinder, ignition means associated with each cylinder and operative in one-two-three-four-five succession substantially at the top-center condition of the piston in each cylinder, first fuel-injection signal-generator means producing a first control-signal output in response to the ignition function in cylinder-one of said succession, second fuel-injection signal-generator means producing a second control-signal output in response to the ignition function in cylinder-three of said succession, third fuel-injection signal-generator means producing a third control-signal output in response to the ignition function of cylinder-five of said succession, the first control-signal output being connected to the fuel-injection devices associated with said cylinders three and four, the second control-signal output being connected to the fuel-injection devices associated with said cylinders five and one, and the third control-signal output being connected to the fuel-injection device associated with said cylinder-two.
In a two-cycle internal combustion engine having at least four cylinders, each cylinder having an associated crankcase with a gas-flow inlet including a check valve, and each cylinder having an exhaust outlet exclusive of the associated crankcase region, means operating in timed relation with a piston in each cylinder for admitting to the associated combustion region gas compressed in the associated crankcase region, an electrically operable fuel-injection device associated with each cylinder for injection fuel into the crankcase region of that cylinder, ignition means associated with each cylinder and successively operative substantially at the top-center condition of the piston in each cylinder, fuel-injection signal-generator means producing a first square-wave control-signal output in response to the ignition function in one of said cylinders, said fuel-injection signal-generator means producing a second square-wave control-signal output in response to the ignition function in a second cylinder whose cycle is in the range of 120-degrees to 180-degrees phase-displaced from said one cylinder, the first control-signal output being connected to the fuel-injection devices of at least a first two cylinders other than said one cylinder, the second control-signal output being connected to the fuel-injection devices of at least a second two cylinders other than said second cylinder and other than said first two cylinders, and selectively variable control means connected to said signal-generator means for coordinating the generation of square-wave signals of like but selectively variable duration in both said control-signal outputs.
Dependencies are inferred from the claim text.