Vehicle steering control
First Claim
1. A drive system for a vehicle having a steerable wheel, the system comprising wheel slip measuring means for measuring a negative slip rate of said steerable wheel, drive means for driving said steerable wheel, and control means arranged to receive signals from said wheel slip measuring means, and to control the drive means to increase the driving torque to the steerable wheel if the negative slip rate of the steerable wheel is greater than a desired negative slip rate, wherein the system includes two steerable wheels and drive means for measuring the negative slip rate is arranged to independent drive, each of said steerable wheels, the wheel slip measuring means being arranged to measure a negative slip rate of each of said steerable wheels, and the control means being arranged to increase the drive to either of said steerable wheels if its negative slip rate is greater than said desired negative slip rate.
2 Assignments
0 Petitions
Accused Products
Abstract
A drive system for a vehicle having steerable front wheels comprises wheel speed sensors for the front wheels, drive motors for driving the front wheels, and a control unit arranged to receive signals from the sensors, to determine from the signals received by the control unit the speed of the front wheels and the ground speed of the vehicle, and to control the drive motors to increase the drive to the front wheels if the speed of the wheels is less than a desired wheel speed for the determined ground speed, indicating that the steerable wheels are slipping.
-
Citations
15 Claims
- 1. A drive system for a vehicle having a steerable wheel, the system comprising wheel slip measuring means for measuring a negative slip rate of said steerable wheel, drive means for driving said steerable wheel, and control means arranged to receive signals from said wheel slip measuring means, and to control the drive means to increase the driving torque to the steerable wheel if the negative slip rate of the steerable wheel is greater than a desired negative slip rate, wherein the system includes two steerable wheels and drive means for measuring the negative slip rate is arranged to independent drive, each of said steerable wheels, the wheel slip measuring means being arranged to measure a negative slip rate of each of said steerable wheels, and the control means being arranged to increase the drive to either of said steerable wheels if its negative slip rate is greater than said desired negative slip rate.
- 10. A drive system for a vehicle having a steerable wheel, the system comprising steering angle measuring means for measuring the steering angle of said steerable wheel, wheel slip measuring means for measuring the slip rate of said steerable wheel, torque demand means for indicating a demand for torque from a driver of the vehicle, and torque control means arranged to monitor the slip rate measured by the wheel slip measuring means and to control the torque supplied to said steerable wheel thereby to control said slip rate to a desired slip rate, wherein the desired slip rate is dependent on the torque demand and the steering angle.
Specification