FUEL INJECTED ENGINE SYSTEM
First Claim
1. An engine system, comprising:
- an engine having a fuel and air supply circuit and an exhaust circuit;
a temperature sensor mounted on an exterior of the engine;
an oxygen sensor located in the exhaust circuit and operable to provide a signal indicative of the oxygen content of engine exhaust gases;
a throttle body mounted on the engine and having a throttle valve to control the flow rate of air delivered to the engine;
a fuel injector carried by the throttle body to deliver fuel to the engine;
a fuel rail carried by at least one of the throttle body and the fuel injector and having an input to receive a supply of fuel and an outlet through which fuel is routed to the fuel injector; and
an engine control unit communicated with the temperature sensor, the oxygen sensor, the throttle valve and the fuel injector to control the fuel and air mixture provided to the engine as a function of the temperature sensor output and the oxygen sensor output.
6 Assignments
0 Petitions
Accused Products
Abstract
An engine system may include a fuel and air supply circuit and an exhaust circuit, a temperature sensor mounted on an exterior of the engine and an oxygen sensor located in the exhaust circuit. The fuel and air supply circuit may include a throttle body mounted on the engine and having a throttle valve to control the flow rate of air delivered to the engine, a fuel injector carried by the throttle body to deliver fuel to the engine and a fuel rail carried by at least one of the throttle body and the fuel injector and having an input to receive a supply of fuel and an outlet through which fuel is routed to the fuel injector. An engine control unit may be communicated with these components to control the fuel and air mixture provided to the engine as a function of the temperature and oxygen sensor outputs.
56 Citations
31 Claims
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1. An engine system, comprising:
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an engine having a fuel and air supply circuit and an exhaust circuit; a temperature sensor mounted on an exterior of the engine; an oxygen sensor located in the exhaust circuit and operable to provide a signal indicative of the oxygen content of engine exhaust gases; a throttle body mounted on the engine and having a throttle valve to control the flow rate of air delivered to the engine; a fuel injector carried by the throttle body to deliver fuel to the engine; a fuel rail carried by at least one of the throttle body and the fuel injector and having an input to receive a supply of fuel and an outlet through which fuel is routed to the fuel injector; and an engine control unit communicated with the temperature sensor, the oxygen sensor, the throttle valve and the fuel injector to control the fuel and air mixture provided to the engine as a function of the temperature sensor output and the oxygen sensor output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A throttle body assembly for use with an internal combustion engine, comprising:
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a main body including a throttle bore through which air is delivered to the engine; a throttle valve carried by the throttle body and moveable between a first position substantially restricting air flow from the throttle bore and a second position permitting a greater flow rate of air from the throttle bore than the first position; a fuel rail carried by the throttle body so that the fuel rail can be oriented in a plurality of positions relative to the throttle body, the fuel rail having an inlet through which fuel is received and an outlet through which fuel is routed to a fuel injector; and a retainer that secures the fuel rail to the throttle body and retains a desired orientation of the fuel rail. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. An engine, comprising:
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a main body and one or more cooling fins integrally formed on at least part of the main body; a temperature sensor coupled to a cooling fin by direct engagement of a portion of the temperature sensor with the cooling fin and without requiring any void formed in the cooling fin; and a resilient clip having a first portion overlying part of the temperature sensor and a second portion overlying the cooling fin to trap the temperature sensor against the cooling fin under a compressive force. - View Dependent Claims (17, 18)
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19. A method of retrofitting an engine designed for use with a carbureted fuel supply system for use with a fuel injection fuel supply system, comprising:
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attaching an engine temperature sensor to an exterior of the engine having an output signal indicative of the engine temperature; providing an oxygen sensor in communication with an exhaust circuit of the engine where the oxygen sensor has an output signal indicative of the oxygen content of exhaust gases from the engine; providing a throttle body with a throttle valve to control air flow to the engine; providing a fuel injector to control fuel flow to the engine. - View Dependent Claims (20, 21, 22)
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23. A method of operating an engine used with a fuel system having an engine position or speed sensor and an ignition module, the method comprising:
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detecting engine rotation with the engine position or speed sensor; determining the time period for engine revolutions; comparing the time period for one engine revolution to the time period of the previous engine revolution; determining a compression stroke from an exhaust stroke based on the compared engine revolution time periods; and providing an ignition signal from the ignition module during the compression stroke and not during the exhaust stroke. - View Dependent Claims (24, 25, 26, 27, 28)
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29. A method of operating an engine used with a fuel system having an oxygen sensor and an engine control unit in communication with the exhaust sensor, the method comprising:
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providing a predetermined air/fuel mixture to the engine; providing a signal from the oxygen sensor to the engine control unit indicative of the oxygen content of exhaust gas discharged from the engine; adjusting the air/fuel mixture provided to the engine to achieve a signal from the oxygen sensor denoted lambda; comparing the actual air/fuel mixture needed to achieve lambda=1 to the predetermined air/fuel mixture to determine a correction value; utilizing the correction value to alter the air/fuel mixture actually delivered to the engine from the predetermined air/fuel mixture for given operating conditions. - View Dependent Claims (30, 31)
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Specification