Motor-driven power steering apparatus
First Claim
1. A motor-driven power steering apparatus, comprising:
- a motor slip detecting structure for determining a cumulative rotational speed of an electric motor corresponding to a maximum stroke displacement amount of the rack shaft, integrating the detected rotational speed of the electric motor, and estimating that slip is generated in a rotational force transmission system from the electric motor to the rack shaft, where the integral rotational speed of the electric motor becomes more than a prescribed cumulative rotational speed, wherein rotation of the electric motor is converted into a linear stroke of a rack shaft by a power transmission mechanism for steering a tire wheel connected to the rack shaft.
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Accused Products
Abstract
In a motor-driven power steering apparatus for converting rotation of an electric motor into a linear stroke of a rack shaft by an interposition of a power transmission mechanism and steering a tire wheel connected to the rack shaft, there is provided a motor slip detecting means for previously determining a cumulative rotational speed of the electric motor corresponding to a maximum stroke displacement amount of the rack shaft, integrating the rotational speed of the electric motor, and estimating that slip or idle running is generated in a rotational force transmission system from the electric motor to the rack shaft, where the integral rotational speed of the electric motor becomes more than a prescribed cumulative rotational speed.
45 Citations
16 Claims
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1. A motor-driven power steering apparatus, comprising:
a motor slip detecting structure for determining a cumulative rotational speed of an electric motor corresponding to a maximum stroke displacement amount of the rack shaft, integrating the detected rotational speed of the electric motor, and estimating that slip is generated in a rotational force transmission system from the electric motor to the rack shaft, where the integral rotational speed of the electric motor becomes more than a prescribed cumulative rotational speed, wherein rotation of the electric motor is converted into a linear stroke of a rack shaft by a power transmission mechanism for steering a tire wheel connected to the rack shaft. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
Specification