Control system and method of delivering start-up fuel to an engine
AssigneeWalbro Engine Management, L.L.C.
InventorsHiroshi Nakata, Tsuyoshi Watanabe
Life of this patent
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Abstract
A method and system that control delivery of start-up fuel to an engine, in one form includes clocking a first predetermined period of time. The method includes allowing start-up fuel to be supplied to the engine during at least some of the first predetermined period of time. The method also includes clocking a second predetermined period of time that comes after the first predetermined period of time. And the method includes not allowing start-up fuel to be supplied to the engine when the second predetermined period of time is clocking. In another form, the system includes a carburetor and a control unit.
Claims23
A method of controlling fuel delivery to an engine at start-up, the method comprising:
- clocking a first predetermined period of time;
- allowing start-up fuel to be supplied to the engine during at least some of the first predetermined period of time;
- clocking a second predetermined period of time after the first predetermined period of time has ended;
- and
- not allowing start-up fuel to be supplied to the engine during the second predetermined period of time.
A system that controls delivery of start-up fuel to an engine, the system comprising:
- a carburetor defining a start-up fuel supply passage having a valve disposed therein;
- and
- a control unit selectively opening the valve, the control unit having a first timer that clocks a first predetermined period of time during which the valve can open, and the control unit having a second timer that clocks a second predetermined period of time during which the valve is closed.
A start-up fuel delivery control unit for an engine, the control unit comprising:
- an ignition control circuit receiving a rotation voltage signal from a rotation sensor coil of the engine, determining the number of cranking revolutions performed during a single engine crank, and sending a solenoid valve drive signal only during a reference number of cranking revolutions which is less than the total number of cranking revolutions during the single engine crank;
- and
- a solenoid valve control circuit receiving the solenoid valve drive signal and selectively sending a valve open drive signal to a solenoid valve which opens the solenoid valve.
A method of controlling fuel delivery to an engine at start-up, the method comprising:
- monitoring at least one parameter of the engine;
- comparing the at least one parameter to a reference parameter;
- and
- allowing start-up fuel to be supplied to the engine only when a condition between the at least one parameter and the reference parameter is satisfied.
Dependencies are inferred from the claim text.