The residual oil pump is mainly composed of a pump body, an electric motor and a casing. The working principle is as follows: after the motor is energized, the pump body is rotated to suck the fuel from the oil inlet, flow through the inside of the ZYB adjustable type residual oil pump, and then press out from the oil outlet to supply oil to the fuel system. The principle of ZYB adjustable residual oil pump and its fault determination method The residual oil pump is mainly composed of three parts: pump body, motor and outer casing.
The working principle is as follows: after the motor is energized, the pump body is rotated to suck the fuel from the oil inlet, flow through the inside of the ZYB adjustable type residual oil pump, and then press out from the oil outlet to supply oil to the fuel system.
ZYB adjustable residual oil pump shells are crimped at both ends, so that the various components form a non-removable assembly, so the ZYB adjustable residual oil pump is generally not repaired. The additional function of the residual oil pump is completed by a safety valve and a one-way valve. The function of the safety valve is to prevent the oil pipe from rupturing or damaging the residual oil pump when the fuel line is blocked. The calibration pressure of the Botaibang safety valve is 2.6 bar. The check valve is set to prevent the oil circuit from being sealed when the residual oil pump stops working, so that the fuel system maintains a certain residual pressure, so that the engine is easy to start next time.
The ZYB adjustable type residual oil pump is installed on the bottom case of the fuel tank of the whole vehicle, and the bottom case of the oil tank has an oil pool formed by partial depression. When the oil pump is working, the oil is sucked from the oil pool, and the oil outlet is connected to the external oil supply pipe through the oil pipe through the oil tank cover.
The upper part of the oil pump is covered by the fuel tank cap and the fuel tank cap, and the oil pump is tightly pressed into the oil tank. There is an oil and oil return indicator arrow on the oil pump, and the arrow can be used to determine the connection of the pipeline.
The connection of the oil pump circuit:
The oil pump circuit has 5 connection ports, 2 of which are the power supply of the oil pump, and the other 3 channels are the liquid level display. The red color in the power circuit is “+†pole, which should be connected to the interface of the EFI system harness, which is controlled by the relay controlled by the ECU.
The fuel flow provided by the residual oil pump is 80L/hour. The excess oil is recirculated and flows into the fuel tank. The fuel flushes and cools the fuel injection body during the cycle.
Good or bad judgment of ZYB adjustable residual oil pump:
a. Before the ZYB adjustable residual oil pump is damaged, its noise is obviously increased compared with the normal time, and it can be judged by listening to the sound.
b. Detecting the resistance of ZYB adjustable residual oil pump armature winding resistance, the general resistance is about 10~20Ω. If the resistance value is too large or too small, it means that the armature winding has short circuit, bad brush contact or bypass circuit. malfunction.
c. Check the oil delivery of the ZYB adjustable type residual oil pump: remove the oil supply pipe of the ZYB adjustable type residual oil pump, and connect the terminal of the ZYB adjustable type residual oil pump to the voltage of 11.5V or more, and the measuring cup collects fuel from the oil outlet, 30 The amount of pump oil in the second type should be not less than 0.6 liters, otherwise the pump body is faulty for the safety valve.
The ZYB adjustable residual oil pump is an unrepairable part and must be replaced when it is determined to be damaged.
When disassembling and installing the ZYB adjustable residual oil pump, the total power supply must be cut off.
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