Abstract: One embodiment of the present invention is an apparatus including an internal combustion engine for powering a ground travelling vehicle, a throttle control arrangement including a device for sensing position of an operator-adjustable pedal to provide a throttle control signal, a first sensor to sense rotational speed of the engine, a second sensor to sense brake status of the vehicle, a way to determine failure of the throttle control signal, and a way to operate the engine in a limp-home mode in response to the failure, which includes fueling the engine during the limp-home mode of operation in accordance with idle position of the pedal, rotational speed of the engine, and the brake status.

Abstract: An absolute position detector that interprets, rather than avoids, abnormal sensory states. Different combinations of sensors in an array are activated as a marker travels along a path. The current activation/deactivation state of the array is converted into a digital signal that is reliably indicative of the current absolute position of the marker along the path. In a preferred embodiment, a dynamic magnetic field is provided whose current condition represents the current absolute position of a moving marker. As the marker moves, the condition of the field changes to activate different groups of Hall Effect devices in an array. The activated groups may comprise one or more Hall Effect devices in the array, depending on the condition of the field as created by the position of the marker. The current activation/deactivation state of the array is then converted, advantageously via truth table logic, into a digital signal representative of the current position of the marker.

Abstract: An absolute position detector that interprets, rather than avoids, abnormal sensory states. Different combinations of sensors in an array are activated as a marker travels along a path. The current activation/deactivation state of the array is converted into a digital signal that is reliably indicative of the current absolute position of the marker along the path. In a preferred embodiment, a dynamic magnetic field is provided whose current condition represents the current absolute position of a moving marker. As the marker moves, the condition of the field changes to activate different groups of Hall Effect devices in an array. The activated groups may comprise one or more Hall Effect devices in the array, depending on the condition of the field as created by the position of the marker. The current activation/deactivation state of the array is then converted, advantageously via truth table logic, into a digital signal representative of the current position of the marker.