Electric control system for fuel pump

Abstract

The utility model discloses a kind of fuel pump electric control system, it is characterized by: including PWM control circuit, MOS drive circuit, motor drive circuit, power conversion circuit and EMC circuit;The EMC circuit has power input terminal, the output terminal of EMC circuit is connected with the power input terminal of power conversion circuit, motor drive circuit respectively, the first output terminal of power conversion circuit is connected with the power input terminal of PWM control circuit, the second output terminal of power conversion circuit is connected with the power input terminal of MOS drive circuit, PWM control circuit has PWM signal input terminal and start-stop signal input terminal, the signal output terminal of PWM control circuit is connected with the signal input terminal of MOS drive circuit, the signal output terminal of MOS drive circuit is connected with the signal input terminal of motor drive circuit, the output terminal of motor drive circuit is connected with motor.The utility model carries out multiple optimization and innovation on the technical scheme of fuel pump electric control system, significantly improves the performance, reliability and applicability of system.

Description

Technical Field

[0001] This utility model relates to an improved invention of a fuel pump, and more particularly to an improved invention of an electric control system for a fuel pump. Background Technology

[0002] In traditional automotive fuel supply systems, fuel pumps are typically controlled mechanically or using simple electronic methods. This control method has the following problems:

[0003] Low control precision: Traditional mechanical control methods cannot adjust the working state of the fuel pump in real time according to the engine operating conditions, resulting in uneven fuel supply and affecting engine performance.

[0004] High energy consumption: Due to the lack of intelligent adjustment mechanism, the fuel pump often runs at a fixed speed, resulting in unnecessary energy waste.

[0005] Electromagnetic interference issues: As automotive electronic systems become more complex, electromagnetic interference generated by the fuel pump during operation may affect the normal operation of other on-board electronic devices.

[0006] Weak power protection capability: If the vehicle battery is connected in reverse, the existing fuel pump control system is easily damaged, resulting in high maintenance costs and poor reliability.

[0007] Maintenance difficulties: Traditional fuel pump control systems have a relatively simple structure, but they are difficult to diagnose and repair quickly when malfunctions occur, which increases the difficulty of maintenance. Utility Model Content

[0008] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide an electric control system for a fuel pump.

[0009] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: The electric control system for a fuel pump is characterized by comprising a PWM control circuit, a MOS drive circuit, a motor drive circuit, a power conversion circuit, and an EMC circuit; the EMC circuit has a power input terminal, and its output terminal is connected to the power input terminals of the power conversion circuit and the motor drive circuit respectively; the first output terminal of the power conversion circuit is connected to the power input terminal of the PWM control circuit, and the second output terminal of the power conversion circuit is connected to the power input terminal of the MOS drive circuit; the PWM control circuit has a PWM signal input terminal and a start / stop signal input terminal, and its signal output terminal is connected to the signal input terminal of the MOS drive circuit; the signal output terminal of the MOS drive circuit is connected to the signal input terminal of the motor drive circuit, and the output terminal of the motor drive circuit is connected to the motor.

[0010] It also includes a reverse power connection protection circuit. The output terminal of the EMC circuit is connected to the input terminal of the reverse power connection protection circuit, and the output terminal of the reverse power connection protection circuit is connected to the power input terminals of the power conversion circuit and the motor drive circuit, respectively.

[0011] The beneficial effect of this utility model is that the improved fuel pump electric control system integrates multiple functional modules such as PWM control circuit, MOS drive circuit, motor drive circuit, power conversion circuit, EMC circuit and power reverse connection protection circuit. Through the coordinated work of these modules, precise control, efficient drive and comprehensive protection of the fuel pump are achieved, meeting the high performance requirements of modern automobiles for fuel supply systems. Attached Figure Description

[0012] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0013] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0014] The accompanying drawings illustrate the structure of this utility model, and further details will be described below in conjunction with the drawings. In this embodiment, the fuel pump electric control system includes a PWM control circuit, a MOS drive circuit, a motor drive circuit, a power conversion circuit, and an EMC circuit. The EMC circuit has a power input terminal, and its output terminal is connected to the power input terminals of the power conversion circuit and the motor drive circuit, respectively. The first output terminal of the power conversion circuit is connected to the power input terminal of the PWM control circuit, and the second output terminal of the power conversion circuit is connected to the power input terminal of the MOS drive circuit. The PWM control circuit has a PWM signal input terminal and a start / stop signal input terminal. The signal output terminal of the PWM control circuit is connected to the signal input terminal of the MOS drive circuit, and the signal output terminal of the MOS drive circuit is connected to the signal input terminal of the motor drive circuit. The output terminal of the motor drive circuit is connected to the motor, which is part of the fuel pump and is connected to the rotor inside the pump housing, providing rotational power to the rotor.

[0015] As a further improved implementation, the fuel pump electric control system also includes a reverse power connection protection circuit. The output terminal of the EMC circuit is connected to the input terminal of the reverse power connection protection circuit, and the output terminal of the reverse power connection protection circuit is connected to the power input terminals of the power conversion circuit and the motor drive circuit, respectively.

[0016] The working principle of this invention is as follows: The PWM control circuit acquires and converts the PWM signal through a microcontroller, amplifies the current signal in the MOS drive circuit, and then outputs it to the fuel pump drive circuit for electrical signal control. This controls the fuel pump's start-up, shutdown, and fuel supply adjustment. The fuel supply is achieved by adjusting the pulse bandwidth of the PWM signal input to the fuel pump SSR based on the pressure signal feedback from the fuel pressure sensor inside the fuel pump. A low fuel pressure sensor value increases the duty cycle and fuel pump speed to achieve boosting; conversely, a high pressure value decreases the duty cycle and releases pressure. The power conversion circuit converts the car battery voltage into 5V to power the microcontroller. The reverse connection protection circuit protects the module when the positive and negative terminals of the power supply are reversed. The EMC circuit processes the car's input power supply by increasing impedance and inductive reactance to achieve electromagnetic compatibility and electromagnetic interference suppression.

[0017] In summary, the above are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. An electrically controlled fuel pump system, characterized by: It includes a PWM control circuit, a MOS drive circuit, a motor drive circuit, a power conversion circuit, and an EMC circuit. The EMC circuit has a power input terminal, and its output terminal is connected to the power input terminals of the power conversion circuit and the motor drive circuit, respectively. The first output terminal of the power conversion circuit is connected to the power input terminal of the PWM control circuit, and the second output terminal of the power conversion circuit is connected to the power input terminal of the MOS drive circuit. The PWM control circuit has a PWM signal input terminal and a start / stop signal input terminal. The signal output terminal of the PWM control circuit is connected to the signal input terminal of the MOS drive circuit, the signal output terminal of the MOS drive circuit is connected to the signal input terminal of the motor drive circuit, and the output terminal of the motor drive circuit is connected to the motor.

2. The fuel pump electric control system as described in claim 1, characterized in that: It also includes a reverse power connection protection circuit. The output terminal of the EMC circuit is connected to the input terminal of the reverse power connection protection circuit, and the output terminal of the reverse power connection protection circuit is connected to the power input terminals of the power conversion circuit and the motor drive circuit, respectively.

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