Communications: electrical – Continuously variable indicating – With meter reading
Patent
1982-01-28
1984-08-07
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
180168, 34082569, H04Q 900, H04B 100, B62D 128
Patent
active
044646593
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to apparatus for remote control of a vehicle or a mobile engine in executing a sequence of functions that can have motion phases and/or operation phases, such as moving up to a place, loading or unloading goods at this place and moving back from said place, during which sequence different control modes will be employed at different times, such that the vehicle/engine is controlled according to a first control mode while a first phase is executed and then, upon transition to a second phase, switching takes place to a second control mode, said remote control utilizing a system comprising signal transmitting means which are separate from the vehicle/engine, and signal receiving means on the vehicle/engine and which are operatively connectable to actuating means of the vehicle/engine.
BACKGROUND ART
According to the prior art the remote control of movement and operation phases of a vehicle can take place according to several feasible control modes. If during the movement phase the same route to a working place is taken during a large number of sequences, it is suitable to use a guide cable control mode wherein the vehicle/engine during its movement follows an overhead cable or a cable buried in the ground, and control signals are supplied to said cable. These signals generate an electromagnetic field around the cable, that is detected by a set of antenna coils on the vehicle/engine. On the other hand, if the route is frequently changed, perhaps after each sequence, it is more convenient to use a control mode in which the control signals are transmitted by radio. In that case, it is presupposed that an operator who continuously supervises the vehicle/engine attends to the remote control from a control console by means of which practically the same operations can be performed as with the operation control equipment which normally is found on the vehicle/engine.
In the operation phase following the movement phase it is convenient to use the last mentioned control mode or even a manual control mode, since probably the operation phase is often changed.
Switching from one control mode to another and vice versa could be done automatically, e.g. when the transmission of control signals over one control mode is interrupted or ceases. Alternatively, the switching could be done according to a predetermined preference of the control modes. Said pre-requisites for the switching between the control modes could, however, cause non-desirable transitions, e.g. when the transmission of the control signals ceases as a result of a defect in the transmission.
SUMMARY OF THE INVENTION
The object of the present invention is to provide an automatically controlled switching or transition from one control mode to another, said switching eliminating non-desirable transitions caused by accident, spite or defects.
Apparatus embodying the invention comprises a plurality of control devices, at least one of which is located remotely from the vehicle and each of which issues signals to the vehicle in a mode unique to it. Every control device can emit any selected one of a plurality of different operation signals, each commanding performance of a particular operation by the vehicle or some part of it; and in addition every control device can emit switching signals, each of which is distinctive to and designates one of the other control devices and thus signifies that the designated other control device shall assume control of the vehicle. Receiving means at the vehicle comprises a plurality of receivers, one for each control device, each responsive only to signals of the mode emitted by its control device; and preferably each receiver comprises check means for ensuring that only valid and correctly received signals result in outputs to other equipment at the vehicle. For executing the operations commanded by received operation signals the vehicle has actuating means. The vehicle also has a plurality of switching circuits, one for each receiver, so that each switching circuit corresponds to o
REFERENCES:
patent: 3540541 (1970-11-01), Hartley et al.
patent: 3639755 (1972-02-01), Wrege
patent: 4379497 (1983-04-01), Hainsworth et al.
Nilles James E.
Saab-Scania Aktiebolag
Yusko Donald J.
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