Importance

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Abstract

A street sweeping vehicle has a chassis supported on travel wheel units. An engine and an operator control compartment are on the chassis. A single hydrostatic transmission is on the chassis and is operatively connected to the engine and travel wheel units. An accelerator pedal located in the compartment is connected to the engine to vary its operating speed. An electronic and hydraulic control system accessible in the control compartment are connected to the transmission to control it and coordinate the operation of the engine and travel wheel units. The control system has a travel mode responsive to engine speed and a work mode independent of engine speed with control components to coordinate the modes and to permit the dual or separate operation thereof. The transmission has a variable displacement hydraulic pump and at least one hydraulic motor, with the control system operatively connected to each. The control compartment has equivalently equipped laterally positioned operator command stations, making the vehicle selectively operable from either of the two stations. The control system includes a brake defeat valve, an antistall switch, a phase control for phasing pump and motor displacements to achieve higher speeds, a valve for compensating for system pressure, and a electromechanical FNR switch for preventing a change between the travel and work modes unless the pump is in neutral.

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First Claim