The gauge can be XLow fuel warning light: Can be made to illuminatearranged to continue to register the last position at a particular resistance reading from the fuel tankeven when switched off or, if a small pull off sender unit.magnet is used, it will return to its zero position.As a system voltage change would affect the XHigh engine temperature warning light: Cancurrent flowing in all three coils, variations are be made to operate at a set resistance of thecancelled out negating the need for voltage thermistor.stabilisation. The gauges used are as described in theThe air-cored gauge has a number of advantages. Thebe increased but the current in coils A and B will ECU contains a ROM (read only memory) section,decrease. Standard sensors provide information toall three coils will change.Ĭurrent through C will the ECU, which in turn will drive suitable displays. This will often form part of the dashboardthermistor resistance is increased, the current in assembly. The signal conditioning and logic functions are carried outthermistor is the temperature sender. The ballast resistor The block diagram shown in Figure 8.63 is theon the left is used to limit maximum current and representation of a digital instrumentation system. The current flowing and the number of Air-cored gauges work on the same principleturns (ampere-turns) determine the strength of as a compass needle lining up with a magneticthe magnetic flux produced by each coil.Īs the field.number of turns remains constant, the current isthe key factor.įigure 8.62 shows the principle of 8.12.2 Digital instrumentationthe air-cored gauge together with the circuit foruse as a temperature indicator. Themagnet will line up with the resultant of the three Key factfields. Three coils of wire are 8 Electrical systemsused and each produces a magnetic field. The needle of the display is attached to a very290 small permanent magnet. Most voltage stabilisers are at a maximum when the tank is empty.Īir-cored gauges work on the same principle as a compass needle lining up with a magnetic field.
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