| 摘要 |
<p>PURPOSE:To finely set the power shift by moving an assist direction motor current commanding value curve for the torsion torque signal of a steering shaft in parallel in response to vehicle speed, and loosening the gradient. CONSTITUTION:An adding arithmetic constant function portion 13 is constituted to generate a sensor voltage adding factor signal So, which is gradually decreased as vehicle speed increases. A signal S+ or -So is determined by an arithmetic portion 14, of which signal is obtained by adding or subtracting a voltage adding factor signal So to the torsion torque signal S of a torsion torque sensor 21. It is possible to move in parallel an assist direction motor current commanding value i in response to vehicle speed by inputting this signal S+ or -So to an output torque value indicating function portion 15. Further, it is possible to loose the gradient of functions i0-i2 by multiplying a vehicle speed factor signal from a multiplying arithmetic constant function portion 16 by functions i0-i2 of an assist direction motor current commanding value by means of an arithmetic portion 17, as the vehicle speed increases.</p> |
