Hydrostatic drive train controller

Details Hydrostatic drive train controller Hydrostatic drive train controller

1998-06-23

1999-12-07

Nguyen, Hoang

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of distinct...

60426, 60432, F16D 3102

Patent

active

059963425

ABSTRACT:
An anti-stall and bias control for a hydrostatic drive train system is disclosed. The system is used on a hydrostatic drive vehicle with an engine coupled to a first and second hydraulic pump. The first and second hydraulic pumps are coupled to first and second drive motors which drive wheels of the vehicle. The power to the drive motors is controlled by a control unit which output signals proportional to the desired power output from the motors. An engine speed sensor determines the speed of the engine. The control circuit reads the engine speed and determines whether the engine is in a stall condition. If the engine is in a stall condition, the control circuit scales the control signals of the first and second motor to reduce power output. A bias control is also provided to allow the vehicle operator to select greater relative power to either the first or second motor. The bias control outputs a bias signal which is read by the control unit. The bias signal is converted into a scaling value which is multiplied by the control signal to the nonselected motor to reduce power of the motor.

REFERENCES:
patent: 5063740 (1991-11-01), Aihara
patent: 5426939 (1995-06-01), Cottrell
patent: 5873427 (1999-02-01), Ferguson et al.

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