On the good old BMWs with hydraulic steering, you could get Active Steering, i.e. variable steering. They basically introduced a planetary gear set: https://www.youtube.com/watch?v=unL8HpMeVTA
If today you buy a BMW with Active Steering it means you get rear-wheel steering (on top of the standard front-wheel steering, but don't tell the execs, you don't want to need a subscription for front-wheel steering).
On BMWs since the F* (with the electric assist steering) variability was achieved by a variable-ratio steering rack.
Infinite had it with a backup, but it was bad.
On the good old BMWs with hydraulic steering, you could get Active Steering, i.e. variable steering. They basically introduced a planetary gear set: https://www.youtube.com/watch?v=unL8HpMeVTA
If today you buy a BMW with Active Steering it means you get rear-wheel steering (on top of the standard front-wheel steering, but don't tell the execs, you don't want to need a subscription for front-wheel steering).
On BMWs since the F* (with the electric assist steering) variability was achieved by a variable-ratio steering rack.