A control system for a screen of a vehicle includes a global positioning system (GPS), an inertia sensor and a control circuit. The GPS detects a satellite signal from a satellite. The inertia sensor senses motion of the vehicle and correspondingly generates a motion state value. The control circuit performs one of a first determination procedure and a second determination procedure according to the state of the satellite signal. In the first determination procedure, the control circuit calculates the vehicle speed of the vehicle according to the satellite signal, and selectively locks the screen of the vehicle according to the vehicle speed. In the second determination procedure, the control circuit generates a motion signal according to the motion state value, and selectively locks the screen of the vehicle according to the motion signal. Accordingly, driving safety can still be effectively ensured even in the case of poor satellite signals.

At a time that a position detecting device is initiated, an arithmetic processing unit calculates the absolute position of a rotating shaft at the time of initiation, on the basis of first to third analog signals corresponding to first to third angles of rotation, which are detected respectively by first to third rotational angle detectors. During rotation of the rotating shaft, a current position counter detects a current absolute position of the rotating shaft by counting a number of pulses of forward rotation pulses or reverse rotation pulses, corresponding to the first angle of rotation detected by the first rotational angle detector, taking as a standard a total number of pulses corresponding to the absolute position of the rotating shaft at the time of initiation.

There is provided a speed monitoring device which can use a low resolution position sensor and provide a high speed response without false detection. The speed monitoring device stores, in a memory unit, a permitted margin PM, a comparison distance VC which is a maximum movement distance permitted for a moving element within one cycle period, and positional data P(t−nT) (n is a natural number equal to or less than M) of the moving element obtained from the present time t to M cycles ago. During speed determination, whether |P(t)−P(t−nT)|>VC*n+PM holds true is determined for every integer n from 1 to M. When the inequality holds true, it is determined that the speed exceeds the speed limit.

A control system for a screen of a vehicle includes a global positioning system (GPS), an inertia sensor and a control circuit. The GPS detects a satellite signal from a satellite. The inertia sensor senses motion of the vehicle and correspondingly generates a motion state value. The control circuit performs one of a first determination procedure and a second determination procedure according to the state of the satellite signal. In the first determination procedure, the control circuit calculates the vehicle speed of the vehicle according to the satellite signal, and selectively locks the screen of the vehicle according to the vehicle speed. In the second determination procedure, the control circuit generates a motion signal according to the motion state value, and selectively locks the screen of the vehicle according to the motion signal. Accordingly, driving safety can still be effectively ensured even in the case of poor satellite signals.

A display system and a method for display control of a gauge graphic is provided. The display system controls the display device to display the gauge graphic. The gauge graphic includes a scale and a needle movable on the scale. The scale includes a first region and a second region. The display system detects a first movement of the needle beyond a first threshold marking on the scale and towards an end of the first region and controls the display device to gradually unmask a first gradation pattern in the second region based on the detected first movement. The display system further detects a second movement of the needle over the second region and controls the display device to change the unmasked first gradation pattern so that the unmasked first gradation pattern flashes with a defined frequency in the second region based on the detected second movement.

A display system and a method for display control of a gauge graphic is provided. The display system controls the display device to display the gauge graphic. The gauge graphic includes a scale and a needle movable on the scale. The scale includes a first region and a second region. The display system detects a first movement of the needle beyond a first threshold marking on the scale and towards an end of the first region and controls the display device to gradually unmask a first gradation pattern in the second region based on the detected first movement. The display system further detects a second movement of the needle over the second region and controls the display device to change the unmasked first gradation pattern so that the unmasked first gradation pattern flashes with a defined frequency in the second region based on the detected second movement.

At a time that a position detecting device is initiated, an arithmetic processing unit calculates the absolute position of a rotating shaft at the time of initiation, on the basis of first to third analog signals corresponding to first to third angles of rotation, which are detected respectively by first to third rotational angle detectors. During rotation of the rotating shaft, a current position counter detects a current absolute position of the rotating shaft by counting a number of pulses of forward rotation pulses or reverse rotation pulses, corresponding to the first angle of rotation detected by the first rotational angle detector, taking as a standard a total number of pulses corresponding to the absolute position of the rotating shaft at the time of initiation.

Methods, apparatus, and computer storage media are disclosed for vehicle display based on vehicle speed. An example vehicle includes a speed sensor to measure a vehicle speed, a display controller to compare the vehicle speed to a threshold, and a display. The example display is to present, in response to the vehicle speed being less than the threshold, a first button at a button location. The example display is to present, in response to the vehicle speed being greater than or equal to the threshold, a second button at the button location.

A method for monitoring the speed of an inspection unit of a sewer inspection or maintenance system is provided where the inspection unit is movable in a sewer. The method includes a first step in which a driving speed of the inspection unit is detected, a second step in which the detected driving speed is compared with a predetermined driving speed, where a speed indicator is generated based upon the result of the comparison, a third step in which, based upon the generated speed indicator, a colored symbol is selected from a set of colored symbols, and a fourth step in which the selected colored symbol is displayed on a display device. The speed indicator indicates within which speed interval from a set of predetermined speed intervals the detected driving speed falls.

Exemplary embodiments are provided of telematics devices and exemplary corresponding methods. In an exemplary embodiment, a telematics device generally includes a controller, a wireless communication module to transmit ignition information to a remote station, a power input terminal to sense a voltage of the battery, and an ignition input terminal to couple to an ignition line of the vehicle. The controller determines whether the ignition input terminal is coupled to an ignition line of the vehicle, and when the terminal is coupled to an ignition line, the controller determines vehicle ignition turn on and ignition turn off events by detecting voltage changes on the ignition line. When the ignition input terminal is not coupled to an ignition line of the vehicle, the controller senses the voltage of the battery of the vehicle to determine vehicle ignition turn on and turn off events based on sensed voltage changes of the battery.