B - Operations – Transporting – 60 – T
Patent
B - Operations, Transporting
60
T
B60T 8/58 (2006.01) B60K 23/08 (2006.01) B60T 13/58 (2006.01) F16H 61/46 (2006.01)
Patent
CA 2150153
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 brakepressure 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.
Caterpillar Inc.
Kirby Eades Gale Baker
LandOfFree
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