Motor vehicles – Steering gear – With electric power assist
Patent
1995-12-07
1998-04-21
Johnson, Brian L.
Motor vehicles
Steering gear
With electric power assist
318805, 318806, 318718, 318825, H02P 700, H02P 540, B62D 504
Patent
active
057408807
ABSTRACT:
Electric motors having controllable induced armature fields, such as induction motors and synchronous reluctance motors, are used in power assisted steering systems for motor vehicles. Power is conserved by tailoring induced armature fields or rotor flux in accordance with the speeds of motor vehicles including the power assisted steering system. In particular, one or more flux programs or maps are provided for the power assisted steering system with the flux map or program being accessed or addressed by means of the vehicle speed. During low speed operation of the motor vehicle, for example to perform parking maneuvers where speeds are near zero and steering forces are near or at maximum, the rotor flux is programmed to maximum. For high speed operation, such as highway and rural motor vehicle operation, the rotor flux is programmed to a low value so that internal loss mechanisms in the power assist motor and motor controller are minimized yet provide sufficient rotor flux to meet steering needs such as lane changes, obstacle avoidance and the like. Various transition speeds and flux transition curves provide smooth transitions between high flux levels and low flux levels.
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Dixon Richard D.
Ford Global Technologies Inc.
Johnson Brian L.
May Roger L.
Savitt Gary
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