Device for controlling steering force in power steering apparatus
First Claim
1. A device for controlling steering force in a power steering apparatus including an electromagnetic control valve for varying characteristics between manual steering torque and steering output torque by changing an amount of opening thereof in accordance with a control current to be applied,said device comprising:
- a car speed sensor means for detecting a car speed or information varying in connection with said car speed;
a steering angle sensor for detecting a steering angle;
first arithmetic means for calculating a driving condition index corresponding to a driving condition determined by a driver on the basis of said information transmitted from said car speed sensor;
second arithmetic means for calculating a road condition index corresponding to a road condition on the basis of said steering angle transmitted from said steering angle sensor;
correcting means for modifying said driving condition index to form a correction driving condition index which takes any one of a plurality of discrete values which change stepwise depending upon the particular range of values to which said driving index belongs;
control current arithmetic means for calculating an output current value on the basis of said correction driving condition index and said road condition index; and
controlling means for applying said output control current having a value computed by said control current arithmetic means to said electromagnetic valve.
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Accused Products
Abstract
There is disclosed a device for controlling steering force in a power steering apparatus having an electromagnetic control valve according to road and driving conditions. The device includes a car speed sensor, a steering angle sensor, first arithmetic means, second arithmetic means, correcting means, control current arithmetic means and controlling means. The first arithmetic means computes a driving condition index by using car speed information. The second arithmetic means computes a road condition index by using steering angle signals. The correcting means converts the driving condition index into a correction driving condition index which takes any one of several stepwise-varied values. The control current arithmetic means computes an output control current value applied to electromagnetic control valve by the controlling means. The device further includes means for detecting lateral acceleration utilized for controlling the steering force.
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Citations
11 Claims
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1. A device for controlling steering force in a power steering apparatus including an electromagnetic control valve for varying characteristics between manual steering torque and steering output torque by changing an amount of opening thereof in accordance with a control current to be applied,
said device comprising: -
a car speed sensor means for detecting a car speed or information varying in connection with said car speed; a steering angle sensor for detecting a steering angle; first arithmetic means for calculating a driving condition index corresponding to a driving condition determined by a driver on the basis of said information transmitted from said car speed sensor; second arithmetic means for calculating a road condition index corresponding to a road condition on the basis of said steering angle transmitted from said steering angle sensor; correcting means for modifying said driving condition index to form a correction driving condition index which takes any one of a plurality of discrete values which change stepwise depending upon the particular range of values to which said driving index belongs; control current arithmetic means for calculating an output current value on the basis of said correction driving condition index and said road condition index; and controlling means for applying said output control current having a value computed by said control current arithmetic means to said electromagnetic valve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification