Two cycle fuel injection engine
First Claim
1. A method of operating a two-cycle internal combustion engine comprised ofa cylinder block, cylinder head assembly having a cylinder bore, a piston reciprocating in said cylinder bore and forming a variable volume combustion chamber with said cylinder block, cylinder head assembly, a scavenge port opening into said combustion chamber through said cylinder bore and opened and closed by the movement of said piston, an exhaust port opening into said combustion chamber through said cylinder bore and opened and closed by the reciprocation of said piston, and a fuel injector for injecting fuel directly into said combustion chamber, said method comprising the steps of measuring the load on said engine, skipping a number of fuel injections to said combustion chamber for a predetermined number of cycles when the load falls below a predetermined value, advancing the beginning of fuel injection when fuel injection is skipped, and taking action to preclude the escape of unburned fuel from said exhaust port when fuel injection is skipped.
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Accused Products
Abstract
A two-cycle internal combustion engine control method and system wherein economy of fuel consumption and emission control is achieved by skipping fuel injection for a number of cycles dependent upon a decrease in the engine speed and load below a predetermined value. When fuel injection is skipped, the duration of fuel injection is increased. The escape of unburned fuel from the exhaust port is achieved when the fuel injection amount is increased by advancing the timing of the fuel injection and by retarding the opening of the exhaust port.
47 Citations
38 Claims
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1. A method of operating a two-cycle internal combustion engine comprised of
a cylinder block, cylinder head assembly having a cylinder bore, a piston reciprocating in said cylinder bore and forming a variable volume combustion chamber with said cylinder block, cylinder head assembly, a scavenge port opening into said combustion chamber through said cylinder bore and opened and closed by the movement of said piston, an exhaust port opening into said combustion chamber through said cylinder bore and opened and closed by the reciprocation of said piston, and a fuel injector for injecting fuel directly into said combustion chamber, said method comprising the steps of measuring the load on said engine, skipping a number of fuel injections to said combustion chamber for a predetermined number of cycles when the load falls below a predetermined value, advancing the beginning of fuel injection when fuel injection is skipped, and taking action to preclude the escape of unburned fuel from said exhaust port when fuel injection is skipped.
- 20. A two-cycle internal combustion engine comprised of a cylinder block, cylinder head assembly having a cylinder bore, a piston reciprocating in said cylinder bore and forming a variable volume combustion chamber with said cylinder block, cylinder head assembly, a scavenge port opening into said combustion chamber through said cylinder bore and opened and closed by the movement of said piston, an exhaust port opening into said combustion chamber through said cylinder bore and opened and closed by the reciprocation of said piston, a fuel injector for injecting fuel directly into said combustion chamber, means for measuring the load on said engine, control means for skipping a number of fuel injections to said combustion chamber for a predetermined number of cycles when the measured load falls below a predetermined value and for advancing the beginning of fuel injection when fuel injection is skipped, and means for precluding the escape of unburned fuel from said exhaust port when fuel injection is skipped.
Specification