Two-cycle internal combustion engine with reduced unburned hydrocarbons in the exhaust gas and adjustable spark gap electrodes
AssigneeBRQT Corporation
InventorsHarry Cullum, Jonathan Korn
Life of this patent
Estimating the term…
Abstract
A two-cycle internal combustion engine configuration and control strategy in which the unburned hydrocarbon emissions are measured in the exhaust manifold during the scavenging process using a fast response air fuel sensor. The signal from the sensor is used to control the operation of a low pressure ratio blower and the inlet fuel and oil flow. In this way the inlet flow of fuel and air may be reduced which controls the short circuiting loss of fuel during the scavenging process and reduces unburned hydrocarbons in the exhaust gas.
Claims28
In a two-cycle internal combustion engine operable with a source of fuel and a source of air, the engine including a cylinder with inlet and outlet ports, a piston slidable in the cylinder for opening and closing said ports, and fuel injection means, the improvement comprising:
- sensor means for detecting and evaluating a predetermined chemical component in the exhaust gas and providing signal information thereto;
- a blower with an outlet for directing an airflow into the cylinder's inlet port, said fuel injection means having an outlet upstream of and directed into said blower;
- drive means driven by said engine and coupled to said blower for varying the outlet air flow of the blower;
- and
- control means for receiving said signal information from said sensor means as to said predetermined chemical component in the exhaust gas and for controlling the blower airflow into the cylinder to reduce the output of one of said predetermined chemical component and another chemical component.
In a two-cycle internal combustion engine operable with a source of fuel and a source of air, the engine including a cylinder with inlet and outlet ports, a piston slidable in the cylinder for opening and closing said ports, and fuel injection means, the improvement comprising:
- a sensor means for detecting a predetermined chemical component in the exhaust gas and providing signal information thereto;
- a blower with an outlet for directing an airflow into the cylinder's inlet port;
- drive means driven by said engine and coupled to said blower for varying the outlet air flow of the blower;
- and
- control means for receiving said signal information from said sensor means as to said predetermined chemical component in the exhaust gas and for controlling the blower airflow and fuel injection into the cylinder to reduce one of said predetermined chemical component and another chemical component, with the air/fuel ratio generally maintained when the air flow is reduced.
A method of reducing unburned hydrocarbons in the exhaust gas of a two-cycle engine which uses an air blower and fuel injection operable with air flow of the air blower, comprising:
- detecting and evaluating a predetermined chemical component in the exhaust gas and providing corresponding signal information;
- determining the amount of reduction of air flow and included fuel into the engine's cylinder to reduce the output of one of said predetermined chemical component and another chemical component in the exhaust gas;
- and
- providing control means for varying said air flow and included fuel into the engine's cylinder according to said determination of the amount of reduction of air flow and included fuel.
In an internal combustion engine operable with a fuel injection means and a source of air, the improvement comprising:
- a sensor means for detecting and evaluating a predetermined chemical component in the exhaust gas and providing signal information thereto;
- a blower with an outlet for directing an airflow into the cylinder's inlet port;
- drive means driven by said engine and coupled to said blower for varying the outlet air flow of the blower;
- and
- control means for receiving said signal information from said sensor means as to said chemical component in the exhaust gas and for controlling the blower air flow and fuel injection into the cylinder to reduce selected ones of said predetermined chemical component and other chemical components, with the air/fuel ratio generally maintained when the air flow is reduced.
Dependencies are inferred from the claim text.