Steering apparatus for vehicle
First Claim
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1. A steering apparatus for a vehicle which steers both front and rear wheels, comprising:
- an electric power steering unit for steering the rear wheels with a rotational force of a motor;
first sensor for sensing a vehicle speed;
second and third sensors for sensing front and rear wheel steering angles, respectively;
an input signal processor consisting of a waveshaper for receiving and waveshaping a vehicle speed signal from said first sensor;
first and second voltage transformers for transforming front and rear wheel steering angle voltages from said second and third sensors, respectively;
first and second analog to digital converters for converting output signals from said first and second voltage transformers to digital signals representing front and rear steering angles, respectively;
a control circuit supplied with the vehicle speed signal from said input signal processor and said digital signals representing front and rear steering angles from said first and second analog to digital converters, respectively, to generate and supply a signal for steering said rear wheel to said electric power steering unit, said control circuit including a decoder, a plurality of pattern memories, a subtracter, and a timer.
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Abstract
A steering apparatus for a vehicle steers both front and rear wheels and has an electric power steering unit for steering the rear wheels with a rotational force of a motor and a controller for generating a rear wheel steering signal in response to a vehicle speed and a front wheel steering angle. The controller includes a plurality of pattern memories for storing rear wheel steering angles, one of which is read out in response to a detected front wheel steering angle in accordance with ratios of rear wheel steering angles to front wheel steering angles. The ratios are predetermined or given as a function of vehicle speeds.
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Citations
5 Claims
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1. A steering apparatus for a vehicle which steers both front and rear wheels, comprising:
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an electric power steering unit for steering the rear wheels with a rotational force of a motor; first sensor for sensing a vehicle speed; second and third sensors for sensing front and rear wheel steering angles, respectively; an input signal processor consisting of a waveshaper for receiving and waveshaping a vehicle speed signal from said first sensor; first and second voltage transformers for transforming front and rear wheel steering angle voltages from said second and third sensors, respectively; first and second analog to digital converters for converting output signals from said first and second voltage transformers to digital signals representing front and rear steering angles, respectively; a control circuit supplied with the vehicle speed signal from said input signal processor and said digital signals representing front and rear steering angles from said first and second analog to digital converters, respectively, to generate and supply a signal for steering said rear wheel to said electric power steering unit, said control circuit including a decoder, a plurality of pattern memories, a subtracter, and a timer. - View Dependent Claims (2, 3, 4, 5)
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Specification