Fuel injected two cycle engine with progressive throttle linkage

Details Fuel injected two cycle engine with progressive throttle linkage Fuel injected two cycle engine with progressive throttle linkage

1988-04-11

1989-09-12

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Injection or carburetion system having a series of throttle...

123336, 123 73SC, F02B 3304, F02M 3510

Patent

active

048649961

ABSTRACT:
A two cycle crankcase compression fuel injected internal combustion engine has a first set of one or more throttle valves (104, 106) controlling combustion air flowing into the crankcase, and a second set of one or more throttle valves (110, 112) also controlling combustion air flowing into the crankcase. A throttle position sensor (104, 106) and controls fuel injection according to throttle position. Increased resolution of sensed throttle position at low engine speed is provided by admitting combustion air only through the first set of throttle valves (104, 106) and not through the second set of throttle valves (110, 112) at low engine speed for an initial given range of motion, such that greater movement of the first set of throttle valves (104, 106) is required to obtain a given amount of combustion air flow for a given engine speed, prior to opening the second set of throttle valves (110, 112), to provide more accurate fuel injection and better driveability. Progressive throttle linkage (200) is moveable to open the first set of throttle valves (104, 106) through a given range of motion prior to opening the second set of throttle valves (110, 112).

REFERENCES:
patent: 2420925 (1947-05-01), Wirth
patent: 4280465 (1981-07-01), Staerzl
patent: 4300504 (1981-11-01), Tezuka
patent: 4317438 (1982-03-01), Yagi et al.
patent: 4378761 (1983-04-01), Kawamura
patent: 4590897 (1986-05-01), Hundertmark
patent: 4699109 (1987-10-01), Hensel
patent: 4702202 (1987-10-01), Hensel et al.
patent: 4794888 (1989-01-01), Lang
patent: 4794889 (1989-01-01), Hensel

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