Abstract: The present invention provides a system and method for controlling a two-stroke engine in correspondence with exhaust gas temperature. An engine control unit (ECU) receives an output from a temperature sensor mounted in the exhaust pipe. The engine control unit controls the operation of a fuel injector in fluid communication with the intake port of the engine in correspondence with the output from the temperature sensor. In one embodiment, correspondence is achieved by determining fuel injection parameters based on a plurality of maps, each corresponding to a different temperature range. The ECU references the map corresponding to the sensed temperature of the exhaust gas. Fuel injection parameters may include injection timing and the amount of fuel injected.

Abstract: The present invention provides a system and method for controlling a two-stroke engine in correspondence with exhaust gas temperature. An engine control unit (ECU) receives an output from a temperature sensor mounted in the exhaust pipe. The engine control unit controls the operation of a fuel injector in fluid communication with the intake port of the engine in correspondence with the output from the temperature sensor. In one embodiment, correspondence is achieved by determining fuel injection parameters based on a plurality of maps, each corresponding to a different temperature range. The ECU references the map corresponding to the sensed temperature of the exhaust gas. Fuel injection parameters may include injection timing and the amount of fuel injected.

Abstract: A method for improving engine performance, by increasing fuel efficiency and/or power output, and/or by decreasing the output of pollutants. When the temperature of the engine's exhaust system is lower than a target temperature, the ignition position of the cylinders of the engine is changed such that fuel and air propagate from the cylinders into the exhaust system while undergoing combustion. The heat from the combustion of the fuel and air in the exhaust system increases the temperature of the exhaust system. The ignition position may be retarded from the normal operating ignition position by up to 40 degrees or more, or to 10 to 20 degrees after top dead center. The ignition position may be changed manually or automatically. The exhaust temperature may be sensed and displayed. An engine control system for improving engine performance includes an ignition changing mechanism to change the ignition position of the cylinders, and an activating mechanism for activating the ignition changing mechanism.

Abstract: A method for improving engine performance, by increasing fuel efficiency and/or power output, and/or by decreasing the output of pollutants. When the temperature of the engine's exhaust system is lower than a target temperature, the ignition position of the cylinders of the engine is changed such that fuel and air propagate from the cylinders into the exhaust system while undergoing combustion. The heat from the combustion of the fuel and air in the exhaust system increases the temperature of the exhaust system. The ignition position may be retarded from the normal operating ignition position by up to 40 degrees or more, or to 10 to 20 degrees after top dead center. The ignition position may be changed manually or automatically. The exhaust temperature may be sensed and displayed. An engine control system for improving engine performance includes an ignition changing mechanism to change the ignition position of the cylinders, and an activating mechanism for activating the ignition changing mechanism.

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.