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 undesirable slip is generated in a rotational force transmission system between the electric motor to the rack shaft, in the event that all the force generated by the electric motor is not transferred 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.
14 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 undesirable slip is generated in a rotational force transmission system between the electric motor to the rack shaft, in the event that all the force generated by the electric motor is not transferred 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