Controller of non-position sensor direct current brushless electric fuel pump for automobile

Abstract

The invention discloses a controller of a non-position sensor direct current (DC) brushless electric fuel pump for an automobile. The controller provided by the invention can be used for providing stable and reliable operational control, and comprises a microprocessor, a power module, an input module, a driving module and a brushless DC motor, wherein the input module comprises a system voltage collected module and a current and reverse electromotance collection module; and the driving module comprises a A-phase driving module, a B-phase driving module and a C-phase driving module. By virtue of measuring the negative zero crossing points of A-phase reverse electromotance, B-phase reverse electromotance and C-phase reverse electromotance and computing the phase change time of the three phase, the phase change control of the non-position sensor DC brushless electric fuel pump can be carried out, simultaneously the voltage protection, current protection and temperature protection functions of a system can be realized, and the system can be ensured to operate safely and reliably.

Description

technical field [0001] The invention belongs to the technical field of automobile electronics, and relates to a position sensorless DC brushless electric fuel pump controller for automobiles. Background technique [0002] The electric fuel pump is an important part of the automobile fuel supply system. Its function is to pump the fuel out of the fuel tank and supply it to each cylinder of the engine through the fuel injector. The quality of the electric fuel pump directly affects the performance of the vehicle. [0003] For a long time, electric fuel pumps have used brushed DC motors as their power devices. Although brushed DC motors have the advantages of high operating efficiency and good speed regulation performance, due to the use of brush-commutator structures, they are commutated mechanically. However, there are inevitably fatal weaknesses such as noise, sparks, radio interference, and short life. In addition, the disadvantages of high manufacturing cost and difficult...

AI Technical Summary

Problems solved by technology

[0003] For a long time, electric fuel pumps have used brushed DC motors as their power devices. Although brushed DC motors have the advantages of high operating efficiency and good speed regulation performance, due to the use of brush-commutator structures, they are commutated mechanically. However, there are inevitably fatal weaknesses such as noise, sparks, radio interference, and short life, coupled with shortcomings such as high manufacturing costs and difficult maintenance, which greatly limit its application range.

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