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US 2002/0152990 A1Published application
Two-cycle engine with exhaust temperature-controlled ignition timing
AssigneeArctic Cat Inc.
InventorGreg L. Spaulding
Life of this patent
Estimating the term…
Abstract
A two-cycle internal combustion engine has an ignition timing that varies with engine speed. A plurality of ignition patterns (the relationship between ignition timing and engine speed) are used. The engine exhaust gas temperature is sensed and is used to determine the particular ignition pattern used at a particular time.
Claims20
A two-cycle engine, comprising:
- a cylinder;
- a throttle;
- a piston movable in the cylinder, for compressing a fuel-air mixture to be ignited in the cylinder, with exhaust gas from combustion of the fuel-air mixture being expelled from the cylinder;
- an ignition source in the cylinder;
- a controller for activating the ignition source at a particular point during the compressing movement of the piston, the controller activating the ignition source according to an ignition pattern in which the an ignition point during the compressing movement varies with operation speed of the engine and throttle position, the ignition pattern being selected from a plurality of different ignition patterns;
- and
- a sensor for sensing a temperature of exhaust gas from the cylinder, the particular ignition pattern used by the controller being selected based upon the sensed exhaust gas temperature.
4 more elements
A method of operating a two-cycle engine, comprising:
- moving a piston in a cylinder to compress a fuel-air mixture in the cylinder;
- activating an ignition source in the cylinder during the compression movement;
- expelling exhaust gas from combustion of the fuel-air mixture from the cylinder;
- controlling the activation of the ignition source according to an ignition pattern in which an ignition point during the compression movement varies with operation speed and throttle position of the engine;
- and
- sensing a temperature of the exhaust gas expelled from the cylinder;
- and
- selecting the ignition pattern from a plurality of ignition patterns based on the sensed exhaust gas temperature.
5 more elements
A two-cycle engine, comprising:
- a cylinder;
- a piston movable in the cylinder, for compressing a fuel-air mixture to be ignited in the cylinder, with exhaust gas from combustion of the fuel-air mixture being expelled from the cylinder;
- an ignition source in the cylinder;
- a controller for activating the ignition source at a particular point during the compressing movement of the piston, the controller activating the ignition source according to an ignition pattern in which the an ignition point during the compressing movement varies with operation speed of the engine, the ignition pattern being selected from a plurality of different basic ignition patterns;
- and
- a sensor for sensing a temperature of exhaust gas from the cylinder, the basic ignition pattern used by the controller being modified based upon the sensed exhaust gas temperature.
3 more elements
A two-cycle engine, comprising:
- a cylinder;
- a piston movable in the cylinder, for compressing a fuel-air mixture to be ignited in the cylinder, with exhaust gas from combustion of the fuel-air mixture being expelled from the cylinder;
- an ignition source in the cylinder;
- a controller for activating the ignition source at a particular point during the compressing movement of the piston, the controller activating the ignition source according to an ignition pattern in which the an ignition point during the compressing movement varies with operation speed of the engine, the ignition pattern being selected from a plurality of different ignition patterns;
- and
- a sensor for sensing a temperature of exhaust gas from the cylinder, the plurality of ignition patterns including a first ignition pattern that is selected when the sensed exhaust gas temperature is a temperature correlated with an undesired operation condition.
3 more elements
A method of operating a two-cycle engine, comprising:
- moving a piston in a cylinder to compress a fuel-air mixture in the cylinder;
- activating an ignition source in the cylinder during the compression movement;
- expelling exhaust gas from combustion of the fuel-air mixture from the cylinder;
- controlling the activation of the ignition source according to an ignition pattern in which an ignition point during the compression movement varies with operation speed of the engine selected from a plurality of basic ignition patterns;
- and
- sensing a temperature of the exhaust gas expelled from the cylinder;
- and
- modifying the ignition pattern selected from a plurality of ignition patterns based on the sensed exhaust gas temperature.
5 more elements
A method of operating a two-cycle engine, comprising:
- moving a piston in a cylinder to compress a fuel-air mixture in the cylinder;
- activating an ignition source in the cylinder during the compression movement;
- expelling exhaust gas from combustion of the fuel-air mixture from the cylinder;
- controlling the activation of the ignition source according to an ignition pattern in which an ignition point during the compression movement varies with operation speed of the engine;
- and
- sensing a temperature of the exhaust gas expelled from the cylinder;
- and
- selecting a first ignition pattern from a plurality of ignition patterns when the sensed exhaust gas temperature is a temperature correlated with an undesired engine operation.
5 more elements
Dependencies are inferred from the claim text.