Electromagnetic valve drive circuit for engine

A solenoid valve driving and driving circuit technology, which is applied in engine control, machine/engine, electrical control, etc., can solve the problems of driving circuit driving ability, control accuracy, low duty cycle adjustment frequency, and complicated control software writing. , to achieve the effect of shortening the closing time, high precision of current control, and reducing the fluctuation range

Inactive Publication Date: 2005-01-12
TSINGHUA UNIV
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Problems solved by technology

In the high-end and low-end drive circuits, since the hardware circuit only provides the drive current feedback value, the control actions such as sampling and comparing the drive current and adjusting the duty cycle of the high-end power transistor control pulse must be completed by software. This control method is called It is called software current feedback control. The progr

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  • Electromagnetic valve drive circuit for engine
  • Electromagnetic valve drive circuit for engine
  • Electromagnetic valve drive circuit for engine

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[0014] The specific circuit and working process of the present invention will be described in detail below in conjunction with the embodiments and the drawings.

[0015] see figure 1 The present invention mainly includes three parts: a high-end drive circuit, a low-end drive circuit and a signal processing circuit. Take driving a six-way solenoid valve as an example, the high-end drive circuit is located in the solenoid valve L 1 -L 6 (L 2 -L 5 (Not shown in the figure) one end includes two sets of independent drive power supplies and power transistors, one set includes high-voltage drive power U H And high voltage power transistor M H (The model is IRFB61N15D), among which, the high-voltage drive power supply voltage is 100V±50V, generally 100V can be used, and the high-voltage power transistor M H A output by the signal processing circuit H Pulse signal control. The other set includes low-voltage drive power U L And low voltage power transistor M L (The model is IRFB61N15D), tw...

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Abstract

The circuit contains a single processing circuit, it receives the control pulse. A from the electronic control unit of the motor and output high voltage driving pulse Ah and low voltage driving pulse Al to higher extreme driving circuit separately and receive the feedback sampling current signal from lower extreme driving circuit, after processing, the low voltage driving pulse Al adjust the higher extreme driving circuit to adjust the driving circuit of the electromagnetic valve. Lower extreme driving circuit receive pulse signal B from electronic control unit of the motor, this pulse signal is same with the control signal A.

Description

technical field [0001] A solenoid valve driving circuit for an engine relates to the driving of an electromagnetically controlled bypass valve in an electronically controlled diesel engine fuel injection system, and can be used in the related technical field of solenoid valve driving. Background technique [0002] In the electronically controlled engine injection system, there are strict requirements on the closing action of the solenoid valve. Since the closing action of the solenoid valve is closely related to the driving current, the solenoid valve action is mostly realized by precisely controlling the driving current. The performance is particularly obvious in the drive of the engine solenoid valve, and the drive current often requires Figure 4 The two-stage driving current shown, the solenoid valve at T 1 and T 2 The closing action is completed within the time period, and at T 3 The time period remains closed until the end. In order to obtain this type of drive curr...

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Application Information

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IPC IPC(8): F02D1/18F02D41/14F02D41/36
Inventor 张科勋鹿笑冬张奇李建秋欧阳明高
Owner TSINGHUA UNIV
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