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Protection method of fuel pump

A technology of fuel pump and fuel oil, which is applied in the direction of pump control, liquid fuel feeder, liquid variable capacity machinery, etc. It can solve the problems of shortening the service life of the fuel pump and burning the fuel pump, so as to help heat dissipation and prolong the service life Effect

Active Publication Date: 2013-12-11
CHERY AUTOMOBILE CO LTD
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AI Technical Summary

Problems solved by technology

During the operation of the engine, the oil pump generally keeps working uninterruptedly to ensure the oil pressure in the fuel system, but when there is too little oil stored or the fuel is exhausted, if the oil pump continues to work, due to the reduction of heat dissipation from the fuel to the oil pump, it will be greatly shortened. The service life of the fuel pump may even burn out the fuel pump

Method used

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  • Protection method of fuel pump

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Embodiment Construction

[0015] The function of the fuel pump is to deliver the fuel stored in the fuel tank to the fuel line of the injector. Most of the fuel pumps in the early engine fuel system were mechanical, and now electric fuel pumps have replaced them. In addition, some of the original electric fuel pumps installed outside the fuel tank are also built into the fuel tank in consideration of heat dissipation, sound insulation and air resistance. The working principle of the electric fuel pump is the same as that of the electric water pump. It uses a motor to drive the corresponding oil pump device to continuously deliver fuel to the fuel system. It should be known that the fuel system must maintain a certain pressure, only in this way can the fuel sprayed by the injector be better atomized and combustible. But when the engine is turned off, the pressure of the fuel system will be lost. Once there is no residual pressure, it is easy to generate air lock in the pipeline at high temperature. In...

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Abstract

The invention discloses a protection method of a fuel pump. The protection method is characterized in that the protection method comprises the following steps that a fuel pressure signal of a fuel level sensor is received by an automobile body controller; when fuel is insufficient or is exhausted, the fuel pump is controlled by the car body controller to stop working; when a fuel supply point is recovered or a feedback value of a rail pressure sensor is lower than a limit value, the fuel pump is controlled by the car body controller to return to work. By adopting the protection method of the fuel pump, the protection method has the advantages that (1) when trapped fuel is insufficient or the fuel is exhausted, the fuel pump is controlled to stop working, so as to be favorable for self heat dissipation of the fuel pump and prolong the service life; (2) protection is performed in the condition that an engine is in an idling state, and therefore, normal driving of an automobile is not affected; (3) the purpose of protection is realized by software, and any cost is not increased.

Description

technical field [0001] The invention relates to automobile engine technology, in particular to a method for protecting a fuel pump. Background technique [0002] There are various gasoline injection systems used in modern cars, and their fuel supply methods are also different, but they are generally equipped with electric fuel pumps. [0003] The working principle of the electric fuel pump is to use the motor to drive the corresponding oil pump device, so as to continuously deliver fuel to the fuel system. The fuel system must maintain a certain pressure. Only in this way can the fuel sprayed by the injector be better atomized and burn more easily. During the operation of the engine, the oil pump generally keeps working uninterruptedly to ensure the oil pressure in the fuel system, but when there is too little oil stored or the fuel is exhausted, if the oil pump continues to work, due to the reduction of heat dissipation from the fuel to the oil pump, it will be greatly sho...

Claims

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Application Information

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IPC IPC(8): F02M37/08F04B49/06
Inventor 张鹏
Owner CHERY AUTOMOBILE CO LTD
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