Driving mechanism for an automotive propel drive

Details Driving mechanism for an automotive propel drive Driving mechanism for an automotive propel drive

1993-08-10

1995-02-21

Hill, Mitchell J.

Motor vehicles

Power

Including traction motor of kind driven by noncompressible...

180308, B60K 1714

Patent

active

053907590

ABSTRACT:
An automotive control driving mechanism for a vehicle, such as a wheel loader or fork lift, comprising a plurality of wheels (18) supporting a vehicle frame, an engine (16) on the frame for driving the wheels (18), and a hydrostatic transmission having a variable displacement pump (12) operatively connected to the engine (16) and to at least one motor (14). The motor (14) is connected to at least one of the wheels (18) to propel the vehicle. The transmission generates a working system pressure in a pair of fluid conduits (32,34) between its pump (12) and motor (14). A microprocessor (40) is connected to a speed pickup (38) on the engine shaft (39) and conduits (32,34) of the hydrostatic transmission for controlling the displacement of the pump through swashplate (20), and thus the transmission ratio, based not only on the engine speed but also system pressure. The sensed system pressures values are embedded into microprocessor's (40) control algorithms for the transmission ratio. The transmission may also include variable displacement motors controlled in the same manner. When electronically proportional high pressure relief valves are associated with said conduits, improved braking and coasting are realized.

REFERENCES:
patent: 4396087 (1983-08-01), Rock et al.
patent: 4554991 (1985-11-01), Eden
patent: 4704866 (1987-11-01), Myers
patent: 5062498 (1991-11-01), Tobias
patent: 5147010 (1992-09-01), Olson et al.

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