Internal-combustion engines – Charge forming device – Including means responsive to instantaneous change in engine...
Patent
1995-02-07
1997-03-18
Dolinar, Andrew M.
Internal-combustion engines
Charge forming device
Including means responsive to instantaneous change in engine...
123438, 12317918, 261 52, F02M 102, F02M 720
Patent
active
056113129
ABSTRACT:
A small engine carburetor with manually controlled choke and throttle valves and associated idle ports and main metering nozzle supplied with fuel from a common metering chamber. The A/F is automatically adjusted by a solenoid operated poppet valve and/or gear driven needle valve and cooperative electronic control circuitry and system components built-in to the carburetor. A combined accelerator pump and idle circuit shut-off mechanism is also built-in and mechanically operated by the throttle shaft so that only the main nozzle supplies fuel when the engine is running above fast idle. A mechanical choke/throttle interlock mechanism also prevents partial choking when the engine is running above fast idle, and throttle operation above fast idle when choking. An electric motor worm gear drive unit controlled by the automatic system is detachably coupled to, and provides fine incremental adjustment of, the main metering needle and is self-locking to retain set adjustment during engine running and at engine shut-off. Control system components are arranged in a compact overall package characterized by a laterally offset, skewed orientation of control box and carburetor body, with a diaphragm fuel pump and metering chamber sharing box and body for intercooling of electronic and electrical components by incoming fuel while assisting fuel vaporization in the carburetor venturi passage.
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King Eric L.
Swanson Mark S.
Dolinar Andrew M.
Walbro Corporation
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