Car fuel gauge simulator recorder4/7/2023 The cycle of opening and closing of the contacts is continuously repeated. As the bimetal is under tension, more current is required to heat it so as to bend sufficiently to break contact.ĭue to the increased current, a similarly increased bending of the bimetal in the receiver unit occurs which pulls the pointer to the “full” position. When the fuel tank is full, the float is up, and the eccentric shaft raises the earthed contact against the insulated bimetal contact, bending the bimetal in the sender unit. Since the heating coils of the sender and receiver units are connected in series, similar slight bending of the bimetal in the receiver unit takes place, which pulls the pointer to the zero position of the receiver unit. Then the heating coil and bimetal cool and the spring returns to its former position where contact is again made. As soon as the bimetal bends it opens the contact and the circuit breaks. In this position, when the ignition switch is turned on, the current flows through the circuit, and heat is generated in the heating coil causing the bimetal to bend. When the fuel tank is empty, the float is down and the two contacts in the sender unit are just touching. The two units are connected by a wire and receiver current from the battery of the generator. The receiver unit is located on the instrument panel in front of the driver. These types of fuel gauge consist of a heating coil wound around a bimetal strip and on an external float mechanism which acts through a cam and flexible diaphragm so that the position of the float varies the height of earthed contact which in turn varies the tension in the bimetal strip. The sender unit is placed in the fuel tank. It also consists of two nits-the the sender unit and the dash unit or receiver unit. The figure shows a bimetal-type electric fuel gauge. Read Also: What are the Different Types of Lubrication Systems? #2 Bimetal-Type Electric Fuel Gauge For large tanks, the movable contact may be mounted on a vertical axis and driven from the float arm by bevel gears. The float may be either single or double. For small tanks, the movable contact is actuated directly by the float arm. The construction of the fuel gauge depends upon the tank. Vibrations in voltage depend supplied to the gauge do not affect their accuracy as their operation depends upon the proportion of electric current flows through the coils of the dash unit, rather than on the actual strength of their magnetic fields. The current consumption of the gauge is so low (0.15 amp) as to cause no appreciable drain on the electric system. The fuel gauge operates only when the ignition switch is turned on. Since less current is flowing through the F coil, its magnetic field is weaker and the armature is pulled to the left so that the pointer indicates the E (empty side of the dial). Thus, more of the current flowing through the E coil passes through the tank unit. When the tank begins to empty, the float goes down and the resistance of the unit drops. Thus the armature is pulled to the right so that the pointer indicates on the F (full) side of the dial. The current flowing through the E (empty) coil also flows through the F (full) coil. When the tank is full and the float is up, the resistance in the tank unit is high. This produces a magnetic field that acts on the armature to which the pointer is attached.Ī.C. When the ignition switch is turned on, current from the battery flows through the two coils. The dash unit or the instrument board unit consists of two coils spaced 90° apart with an armature and pointer assembly provided at the intersection of the coil axes. The rheostat contact is operated by the float to assume a position on the resistance corresponding to the position of the float in the fuel tank. In these types of fuel gauges, the tank unit comprises a rheostat (resistance coil and movable contact) and float. The two units are connected by a single wire. It consists of two unit-tank units and dash units. Thermostatic-type electric fuel gauge.The following are the types of fuel gauges: Read Also: What is the function of a Fuel Line in a vehicle? Types of Fuel Gauge A fuel gauge is available in many designs, and many gauges have flaws that can make the reading less than accurate. The gauge would include sensing or sending a unit that measures the amount of fuel actually left, and a gauge that relates this information to the outside of the fuel container. These gauges can be used to measure the amount of gasoline or any other type of liquid. It is a part of the car interior that is mounted on the instrument board in front of the driver. A fuel gauge is typically used to indicate to the driver the level of the fuel in the tank.
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