Automatic guided vehicles require an accurate method and apparatus for determining vehicle velocity. The subject apparatus is associated with a vehicle having at least one surface engaging idler wheel. A resolver produces a rotation angle rate signal having a value responsive to the angular rotation rate of the idler wheel. A resolver-to-digital converter receives the rotation rate angle signal and produces a rotation rate pulse signal. A clock substantially continuously produces clock pulse sig...

An automatic speed control system is disclosed in which an error signal Ve, representing the speed error of the vehicle, is added to a ramp voltage, ramping between fixed values, to produce a control signal Vc. Two comparators compare Vc with upper and lower limits, respectively, so as to produce a pulse train on one of two lines depending on the sign of the error and having a mark-space ratio depending on the magnitude of the error. A circuit responds to the first pulse to occur in the pulse tr...

In an apparatus for the control of temperature, a continuously rotating contour disc causes a bimetallic element to execute a slow oscillating motion for alternately turning on and off a switch operatively connected to a heat generating device. The complemental lengths of one off- and one on-period which together constitute a cycle of constant duration, depend upon an arbitrary positioning of the bimetallic element (setting of the desired temperature value) and upon the temperature-responsive de...

Reference thermocouple junctions are maintained at a constant temperature by an insulated housing which surrounds the junctions. A heating element is contained within the housing. Temperature sensing elements disposed within and outside the housing control the heating element. The thermocouple junctions, internal sensing element and heating element can be secured to a metal block within the housing.

A quickly detached cooling fan mounting bracket for a computer, by which a cooling fan can be quickly removed away from a computer chassis without detaching any other peripheral devices, whereby a large enough computer inner space is exposed in order to facilitate rapid replacement of electrical components. The cooling fan mounting bracket includes a cooling fan receptive mount; a cooling fan; a connecting member, which allows the cooling fan receptive mount to be movably installed on the comput...

A method for controlling the fan speed by detecting different power supplies of a mobile electronic device is proposed. When an external power source is used for mobile electronic device and detected by the embedded controller, the first fan control table is used to control the fan speed to increase the heat dissipation capability of the mobile electronic device. When battery power is used as the power source and detected by the embedded controller, a second fan control table is used to control ...

An idling system is disclosed for devices such as internal combustion engines having a speed controlling or governor. When no load is sensed by a load sensing means, a disable means generates a disable signal to deactivate the engine's speed controller after a predetermined time delay period. When a load is sensed, the disable means is itself disabled, allowing the device's speed control means to operate the device at the higher governed speed.

An electronics chassis, preferably a personal computer ("PC") power supply chassis, having a construction free of secondary fabrication operations and a method of manufacture therefor. The chassis comprises: (1) a bendable chassis sheet having a central portion forming a chassis base wall and a plurality of peripheral portions bent with respect to the central portion to form chassis side walls, edges of the side walls having projections interlocking with corresponding projections on edges of the...

A vehicle speed system is described in which an electrical signal representing actual vehicle speed is compared with a stored signal representing desired vehicle speed. Any speed error is used in a servo loop to generate a control signal which tends to reduce the error to zero. In addition, signals representing the actual and desired vehicle speeds are compared in a comparator unit so as to produce a disabling signal when the actual vehicle speed either exceeds the desired speed by more than a p...

An electromagnetic device having a gap area for conducting operating flux has a source of counter flux proximate the gap for confining operating flux to the gap area.