Ab Volvo

Aquastat Ab

Ralph G Dovertie

Sven I Otteblad

Hans E Brelen

Erner T Brynielsson

Stig E Franzen

Lifting body for transporting or lifting objects under water, of the type in which the lifting gas has essentially the same pressure as the surrounding mass of water. The lifting body comprises a pressure measuring instrument which provides a depth position signal, which is arranged to be compared with a desired depth signal and produces a signal which indicates the required force for controlling the position. The desired thus computed command value is compared with the actual exerted lifting force, via a dynamometer, the signal of which is sent via a high pass filter. By thus arranging a double control system with a position loop and a force loop, it is possible to achieve stable control.

Lifting body for diving

A system for combined automatic and manual control of the motion of a vehicle comprises at least one manual control device and automatic equipment with at least one executing device. The executing device is coupled to the manual control device in such a way that a counterforce is generated in the manual control device to the force supplied by the driver. This counterforce is a function of the deviation, produced by the driver, from the intention of the automatic equipment. The automatic equipment is such that, over the whole control range, this counterforce is less than the force that the driver is able to apply on the manual control.

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Goteborg, Sweden

Ralph G Dovertie