B - Operations – Transporting – 61 – H
Patent
B - Operations, Transporting
61
H
138/5, 342/22.1
B61H 13/20 (2006.01) B62D 5/04 (2006.01) B62D 6/02 (2006.01)
Patent
CA 1243922
Abstract of the Disclosure Power Steering Control Apparatus and Method Power assisted steering systems are commonly used on industrial vehicles such as industrial lift trucks. Advantageously, the output of such systems should be responsive to vehicle speed and the systems should be energy efficient. The subject power steering control system includes processor means for receiving a steering demand signal and a speed control signal, producing a high fluid flow rate signal in response to receiving the steering demand signal and to the speed control signal representing a vehicle speed less than or equal to a predetermined vehicle speed, producing a low fluid flow rate signal in response to receiving the steering demand signal and to the speed control signal representing a vehicle speed greater than the predetermined speed, and producing an idle fluid flow rate signal in response to failing to receive the steering demand signal. Hydraulic means receive the high, low, and idle fluid flow rate signals, produce respective predetermined hydraulic fluid flow rates in response to the received signal, and deliver the hydraulic fluid to the steering means.
488134
Caterpillar Industrial Inc.
Smart & Biggar
LandOfFree
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