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US 4,232,572 AGranted
Engine-transmission control system
AssigneeSundstrand Corporation
InventorsWilliam A. Ross, Frederic W. Pollman
Life of this patent
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AssigneeSundstrand Corporation
InventorsWilliam A. Ross, Frederic W. Pollman
Estimating the term…
An engine-transmission control system having an engine associated with a variable hydrostatic transmission with a ratio governor valve to set the transmission ratio and, thus, control engine speed, a horsepower demand signal valve and an engine speed signal valve with the signals derived from these valves being applied in opposition to the ratio governor valve for control thereof, and an engine fuel governor for the engine providing an operating curve for the engine which relates engine speed to engine horsepower to cause operation along the locus of minimum fuel consumption for the engine whereby operation of the transmission to set the engine speed determines engine horsepower by operation of the engine along the operating curve. The system includes linkage means associating an accelerator pedal with the horsepower demand signal valve and the fuel control to provide a range of movement for the horsepower demand signal valve greater than that of the fuel governor, a lost motion connection in the linkage means which permits operation of the fuel governor in advance of the horsepower demand signal valve upon initial operation of the accelerator member, and second linkage means associated with an engine brake member for control of the horsepower demand signal valve without movement of the fuel governor and with relations between the linkage means whereby one linkage means may operate independently of the other.
An engine-transmission control system for an engine utilizing no fuel control other than a fuel governor comprising, a variable hydrostatic transmission, a variable speed engine connected to said transmission, a fuel governor for said engine which provides an engine operating curve conforming to the locus of minimum fuel consumption of the engine and which establishes a particular engine horsepower at any particular engine speed, a horsepower demand signal valve, an engine speed signal valve, and means including a ratio governor valve responsive to horsepower demand and engine speed signals to set the transmission ratio of the hydrostatic transmission and control engine power delivery by action of the fuel governor resulting from the transmission ratio establishing an engine speed.
An engine-transmission control system comprising, a variable hydrostatic transmission, a variable speed engine connected to said transmission, a fuel governor for said engine operable to establish a certain engine horsepower at any engine speed which is established while providing an engine operating curve conforming to the locus of minimum fuel consumption for the engine, a horsepower demand signal valve, an engine speed signal valve, means including a ratio governor valve responsive to horsepower demand and engine speed signals to set the transmission ratio of the hydrostatic transmission and establish engine speed, an accelerator member, and linkage means interconnecting said accelerator member with said fuel governor and with said horsepower demand signal valve and operable to set the fuel governor at a full open position in advance of substantial movement of the horsepower demand signal valve.
Dependencies are inferred from the claim text.