Dynamic braking on an all wheel drive machine

Details Dynamic braking on an all wheel drive machine Dynamic braking on an all wheel drive machine

1994-07-15

1996-02-06

Oberleitner, Robert J.

Motor vehicles

Having four wheels driven

Including pump and fluid motor, or generator and electric...

180306, 180307, 303190, B60K 2816

Patent

active

054890071

ABSTRACT:
Dynamic braking on the all wheel drive front wheel motors of a motor grader is implemented by turning on all the wheel drive system, depressing the inching pedal, sensing brake pressure, determining ground speed, determining a pump set point current using the ground speed, and setting actual pump current to 90% of set point current. Both sides of the drive loop are monitored and the high side pressure is used to control loop pressure. Motor displacement which is normally controlled by shift lever position is set to low displacement for braking. When the all wheel drive system is turned off, the inching pedal is released, or there is a loss of brake pressure the all wheel drive system disengages. The pump upstrokes to provide an anti-lock feature when the desired brake pressure is less than 30% of the set point. The pump upstrokes to reduce pressure and thereby limit maximum pressure when the desired brake pressure exceeds 30,000 kPa. When the desired brake pressure exceeds 90% of the set point the pump upstrokes to prevent the pump from driving the wheel motors.

REFERENCES:
patent: 3841423 (1974-10-01), Holtkamp et al.
patent: 4317331 (1982-03-01), Aruga et al.
patent: 4530416 (1985-07-01), Kassai
patent: 4554991 (1985-11-01), Eden
patent: 4866622 (1989-09-01), Dreher et al.
patent: 5147010 (1992-09-01), Olsen et al.

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