11-01-2013, 03:51 PM
Electronic Suspension Control System And Electronic Steering Control
[attachment=46762]
The body acceleration measurement can be used to evaluate ride quality. The controller does this by computing a weighted average of the spectrum of the acceleration.
The relative body/wheel motion can be used to estimate tire normal force, and damping is then adjusted to try to optimize this normal force.
The yaw rate sensor provides data which in relationship to vehicle speed and steering input measurements can be used to evaluate cornering performance.
Under program control in accordance with the control strategy, the electronic control system generates output electrical signals to the various actuators.
For speeds below 10 mph, the rear steering angle is in the opposite direction to the front steering angle. This control strategy has the effect of decreasing the car’s turning radius by as much as 30% from the value it has for front wheel steering only.
At intermediate speeds (e.g., 11mph < U < 30mph), the steering might
be front wheel only. At higher speeds (including highway cruise), the front and rear wheels are steered in the same direction.
In this strategy, the rear wheels turn in the opposite direction to the front wheels for a very short period (on the order of one second) and then turn in the same direction as the front wheels.
Notice that the 4WS strategy yields a lane change in a shorter distance and avoids the overshoot common in a standard-steering vehicle.
[attachment=46762]
The body acceleration measurement can be used to evaluate ride quality. The controller does this by computing a weighted average of the spectrum of the acceleration.
The relative body/wheel motion can be used to estimate tire normal force, and damping is then adjusted to try to optimize this normal force.
The yaw rate sensor provides data which in relationship to vehicle speed and steering input measurements can be used to evaluate cornering performance.
Under program control in accordance with the control strategy, the electronic control system generates output electrical signals to the various actuators.
For speeds below 10 mph, the rear steering angle is in the opposite direction to the front steering angle. This control strategy has the effect of decreasing the car’s turning radius by as much as 30% from the value it has for front wheel steering only.
At intermediate speeds (e.g., 11mph < U < 30mph), the steering might
be front wheel only. At higher speeds (including highway cruise), the front and rear wheels are steered in the same direction.
In this strategy, the rear wheels turn in the opposite direction to the front wheels for a very short period (on the order of one second) and then turn in the same direction as the front wheels.
Notice that the 4WS strategy yields a lane change in a shorter distance and avoids the overshoot common in a standard-steering vehicle.