Comparator for the control system of an automatic steering unit

Abstract From the Canadian patent

A comparator for the control system of the automatic steering unit of a vehicle, the comparator comprising the following characteristics: the vehicle is equipped with two sensors sensing a directrix or guide line either in parallel with each other or jointly, the comparator establishes as, input magnitudes for the control, the difference between three magnitudes, namely the two output signals from the sensors, which are functions of the distances from the directrix or directrices, and an auxiliary control magnitude fed back from the steering, the comparator communicates with the sensors through two hydraulic lines and is influenced by output magnitudes in the form of pressure; the …