Acquisition and processing circuit of oil sprayer driving currents

A technology for collecting, processing and driving current, which is applied in the direction of machines/engines, instruments, engine components, etc., can solve the problems of poor transmission anti-interference ability, high cost of current clamp, and large interference of switching circuits, etc., and achieve reliable isolation effect and low cost , compact effect

Inactive Publication Date: 2015-03-18
LIANCHUANG AUTOMOBILE ELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of the current clamp sampling method is that the circuit is simple and does not require subsequent processing circuits; the disadvantage is that the cost of the current clamp is high, the switching circuit has large interference, and the output signal is single-ended, and the transmission anti-interference ability is poor

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  • Acquisition and processing circuit of oil sprayer driving currents
  • Acquisition and processing circuit of oil sprayer driving currents
  • Acquisition and processing circuit of oil sprayer driving currents

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Embodiment Construction

[0017] see figure 1 As shown, the fuel injector drive current acquisition and processing circuit is composed of four parts: current transformer, rectifier circuit, filter circuit and differential conversion circuit; through reasonable circuit design, the drive current of the fuel injector under test is passed through the current transformer After coupling, rectification, filtering and differential conversion, the collected current signal is output as a differential voltage.

[0018] Since the transformer is used to couple the collected current, it will not affect the normal operation of the fuel injector and has a good isolation effect. The collected current signal is transmitted in differential mode, which has good anti-interference ability. For the output current waveform diagram in the practical application of the fuel injector drive current acquisition and processing circuit, see figure 2 As shown in the figure, the figure shows the 5 injection current waveforms of the ...

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Abstract

The invention discloses an acquisition and processing circuit of oil sprayer driving currents. Each oil sprayer return circuit guide wire correspondingly directly penetrates through a primary coil of a current transformer. The cathode of a diode is connected with one end of a first capacitor, one end of a second capacitor, one end of a first resistor and one end of a common mode choke primary end, and the anode of the diode is connected with the other end of the first capacitor and one end of a secondary coil of the current transformer. The other end of the secondary coil of the current transformer is connected with the other end of the second capacitor, the other end of the first resistor and the other end of the common mode choke primary end. One end of a common mode choke secondary end is connected with one end of a second resistor and one end of a third capacitor, and the other end of the common mode choke secondary end is connected with one end of a third resistor and one end of a fourth capacitor. The other end of the second resistor and the other end of the third capacitor are connected with the other end of the third resistor and the fourth capacitor and are grounded. The acquisition and processing circuit can achieve real-time acquisition of working currents of an oil sprayer on the condition that normal operation of oil sprayer return circuits is not influenced.

Description

technical field [0001] The invention relates to the field of automobile fuel injectors, in particular to a fuel injector drive current acquisition and processing circuit. Background technique [0002] For the acquisition of injector driving current, there are usually two acquisition methods on the market, namely resistance sampling method and current clamp sampling method. [0003] The resistance sampling method is to connect the sampling resistance in series in each injector circuit, amplify the output through the low noise amplifier. The advantage of the resistance sampling method is that the cost is low; the disadvantage is that the subsequent processing circuit is complex, the sampling resistance will affect the impedance characteristics of the injector circuit itself, and the isolation from the injector circuit cannot be realized. [0004] The current clamp sampling method is divided into two schemes, one is to connect a current clamp in series in each injector circuit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M65/00
Inventor 孙耀军韩本忠李卫华周华孙立业童毅
Owner LIANCHUANG AUTOMOBILE ELECTRONICS
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