Fuel injection device for multi cylinder two stroke engine
First Claim
1. A two stroke, crankcase compression, internal combustion engine having a cylinder block with at least two cylinder bores, a crankcase associated with said cylinder bores and having at least two crankcase chambers each associated with a respective one of said cylinder bores and sealed from each other, charge forming means for supplying a fuel charge to said cylinders, a crankcase pressure sensor associated with only one of said crankcase chambers for sensing the pressure therein, means responsive to the output of said crankcase pressure sensor for controlling the amount of fuel supplied to each of said cylinder bores, abnormal condition sensing means for sensing an abnormal condition which may affect the operation of said pressure sensor, and means for discontinuing the supply of fuel to the cylinder associated with said one of said crankcase chambers upon the sensing of an abnormal condition by said abnormal condition sensing means.
1 Assignment
0 Petitions
Accused Products
Abstract
A system for controlling the supply of fuel to a multiple cylinder, two cycle, crankcase compression, internal combustion engine wherein air flow is normally measured by a pressure sensor in the crankcase chamber of only one of the cylinders. When an abnormal condition is sensed, the supply of fuel to the cylinder associated with the pressure sensor is discontinued and in some embodiments, the control of the fuel to the other cylinders is accomplished by means other than pressure sensing.
26 Citations
30 Claims
- 1. A two stroke, crankcase compression, internal combustion engine having a cylinder block with at least two cylinder bores, a crankcase associated with said cylinder bores and having at least two crankcase chambers each associated with a respective one of said cylinder bores and sealed from each other, charge forming means for supplying a fuel charge to said cylinders, a crankcase pressure sensor associated with only one of said crankcase chambers for sensing the pressure therein, means responsive to the output of said crankcase pressure sensor for controlling the amount of fuel supplied to each of said cylinder bores, abnormal condition sensing means for sensing an abnormal condition which may affect the operation of said pressure sensor, and means for discontinuing the supply of fuel to the cylinder associated with said one of said crankcase chambers upon the sensing of an abnormal condition by said abnormal condition sensing means.
- 12. A method of operating a two stroke, crankcase compression, internal combustion engine having a cylinder block with at least two cylinder bores, a crankcase associated with said cylinder bores and having at least two crankcase chambers each associated with a respective one of said cylinder bores and sealed from each other, charge forming means for supplying a fuel charge to said cylinders, a crankcase pressure sensor associated with only one of said crankcase chambers for sensing the pressure therein, means responsive to the output of said crankcase pressure sensor for controlling the amount of fuel supplied to each of said cylinder bores, said method comprising the steps of sensing an abnormal condition which may affect the operation of said pressure sensor, and discontinuing the supply of fuel to the cylinder associated with said one of said crankcase chambers upon the sensing of an abnormal condition by said abnormal condition sensing means.
- 23. A two stroke, crankcase compression engine having a cylinder block with at least two cylinder bores, a crankcase associated with said cylinder bore and having at least two crankcase chambers each associated with a respective one of said cylinder bores and sealed from the others, charge forming means for supplying a fuel charge to said cylinders, a crankcase pressure sensor associated with only one of said crankcase chambers for sensing the pressure therein, means responsive to the output of said crankcase pressure sensor for controlling the amount of fuel supplied to each of said cylinder bores, abnormal condition sensing means for sensing an abnormal condition which may affect the operation of said pressure sensor, and means for controlling the supply of fuel to the cylinder other than the cylinder associated with the one of the cylinders in response to other conditions when the abnormal condition sensing means senses an abnormal condition.
- 27. A method of operating a two stroke, crankcase compression engine having a cylinder block with at least two cylinder bores, a crankcase associated with said cylinder bore and having at least two crankcase chambers each associated with a respective one of said cylinder bores and sealed from the others, charge forming means for supplying a fuel charge to said cylinders, a crankcase pressure sensor associated with only one of said crankcase chambers for sensing the pressure therein, means responsive to the output of said crankcase pressure sensor for controlling the amount of fuel supplied to each of said cylinder bores, said method comprising the steps of sensing an abnormal condition which may affect the operation of said pressure sensor, and controlling the supply of fuel to the cylinder other than the cylinder associated with the one of the cylinders in response to other conditions when the abnormal condition sensing means senses an abnormal condition.
Specification