阅读说明：本技术 一种全参数可调的直喷喷油器驱动器 (Full-parameter-adjustable direct-injection fuel injector driver ) 是由 许敏 李雪松 叶昌 徐宏昌 胥浩天 于 2020-06-30 设计创作，主要内容包括：本发明公开了一种全参数可调的直喷喷油器驱动器,涉及喷油嘴驱动器领域,包括硬件部分和软件部分,所述软件部分包括供电模块,逻辑控制模块,控制模块和电流检测模块,所述供电模块可稳定电压并将所述电压升高至20-120V；所述逻辑控制模块可控制电流并完成直喷喷油器的预磁化、开启、到达峰值、保持和关闭操作；所述控制模块可控制所述供电模块的所述电压升高的数值、所述逻辑控制模块可控制所述电流的数值以及电路的开关管状态；所述电流检测模块可检测所述控制模块的所述电流的数值并反馈给所述控制模块。该发明的成本更低,参数可灵活配置,且控制界面简单,方便测试人员使用。(The invention discloses a direct injection injector driver with adjustable full parameters, which relates to the field of injector drivers and comprises a hardware part and a software part, wherein the software part comprises a power supply module, a logic control module, a control module and a current detection module, and the power supply module can stabilize voltage and increase the voltage to 20-120V; the logic control module can control current and complete the operations of pre-magnetization, opening, peak value reaching, holding and closing of the direct injection fuel injector; the control module can control the voltage rising value of the power supply module, the logic control module can control the current value and the switching tube state of the circuit; the current detection module can detect the current value of the control module and feed back the current value to the control module. The invention has the advantages of lower cost, flexible parameter configuration, simple control interface and convenient use by testing personnel.)

1. A full-parameter-adjustable direct-injection fuel injector driver comprises a hardware part and a software part, and is characterized in that the hardware part comprises a power supply module, a logic control module, a control module and a current detection module, wherein the power supply module can stabilize voltage and increase the voltage to 20-120V; the logic control module can control current and complete the operations of pre-magnetization, opening, peak value reaching, holding and closing of the direct injection fuel injector; the control module can control the voltage rising value of the power supply module, the current value controlled by the logic control module and the switching tube state of a circuit; the current detection module can detect the current value of the control module and feed back the current value to the control module.

2. The full parameter adjustable direct injection injector driver of claim 1, wherein said power supply module includes a boost circuit and a filter regulation circuit.

3. The full parameter adjustable direct injection injector driver according to claim 1, wherein said hardware component comprises an upper computer operator interface configured to configure said direct injection injector driver parameters, monitor said direct injection injector status, and store data.

4. The full parameter adjustable direct injection injector driver according to claim 3, wherein said host operator interface and said direct injection injector driver are communicatively coupled via a serial port.

5. The full parameter tunable direct injection fuel injector driver according to claim 4, wherein the back-office software of the host computer operator interface is written in LabVIEW.

6. The full parameter adjustable direct injection injector driver according to claim 3, wherein said logic control module controls said current through a pre-magnetization phase, a spike phase, a hold first phase, a hold second phase, and a shut-off phase.

7. The full parameter adjustable direct injection injector driver according to claim 6, wherein the timing of said pre-magnetization phase is configurable via said upper computer operator interface.

8. The full parameter adjustable direct injection injector driver according to claim 6, wherein a voltage value corresponding to said current during said peak phase is settable via said upper computer operating interface.

9. The full parameter adjustable direct injection injector driver according to claim 6, wherein said time to maintain said current in said first phase is settable via said upper computer operator interface.

10. The full parameter adjustable direct injection injector driver according to claim 6, wherein said time to maintain said current for said second phase is settable via said upper computer operator interface.

Technical Field

The invention relates to the field of fuel injector drivers, in particular to a full-parameter adjustable direct-injection fuel injector driver.

Background

The oil injector is a core component of an engine control system, and the oil injector driver is used for accurately controlling the oil injector so as to ensure accurate oil injection timing, oil injection quantity and oil injection speed. The driving process of the present high pressure injector driver comprises an opening phase, a peak and hold phase, and a closing phase. Meanwhile, in order to accelerate the opening process, some fuel injector drivers have a pre-magnetization stage. In addition, for rapid shut-off, the injection driver is provided with a negative-voltage acceleration shut-off function. In order to avoid faults such as short circuit and open circuit of the solenoid valve coil, the general oil injection driver is also provided with a fault automatic detection function. The injector driver comprises software and hardware, wherein the software comprises fuel injection driving logic control, current closed-loop control and boost control and is used for accurately controlling the current of the injector so as to achieve the purpose of controlling the electromagnetic valve of the injector. The hardware part comprises a booster circuit, a logic control circuit and a diagnosis circuit. At present, however, the fuel injector driver with adjustable full parameters still depends on import and is expensive; most oil injection drivers have no pre-magnetization process, and the development response is slow; the setting of the fuel spray nozzle driver with adjustable full parameters is complex, and the use of a tester is inconvenient.

The invention aims to solve the technical problem of how to reduce the cost of a full-parameter adjustable oil nozzle driver, enable the oil nozzle driver to have a pre-magnetization function and flexibly configure the parameters of the oil nozzle driver according to different oil injector requirements.

Therefore, those skilled in the art are dedicated to develop a full-parameter adjustable driver of a direct injection injector, which reduces the cost of the full-parameter adjustable driver of the injection nozzle, enables the driver to have a pre-magnetization function, and can flexibly configure parameters of the driver of the injection nozzle according to different requirements of the injector.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the technical problem to be solved by the present invention is how to reduce the cost of a full parameter adjustable injector driver while providing it with a pre-magnetization function, and also to flexibly configure injector driver parameters according to different injector requirements.

In order to achieve the above object, the present invention provides a full parameter adjustable driver of a direct injection injector, comprising a hardware part and a software part, wherein the hardware part comprises a power supply module, a logic control module, a control module and a current detection module, and the power supply module can stabilize voltage and raise the voltage to 20-120V; the logic control module can control current and complete the operations of pre-magnetization, opening, peak value reaching, holding and closing of the direct injection fuel injector; the control module can control the voltage rising value of the power supply module, the current value controlled by the logic control module and the switching tube state of a circuit; the current detection module can detect the current value of the control module and feed back the current value to the control module.

Further, the power supply module comprises a boost circuit and a filtering voltage stabilizing circuit.

Furthermore, the hardware part comprises an upper computer operation interface, and can configure the parameters of the direct injection injector driver, monitor the state of the direct injection injector and store data.

Further, the upper computer operation interface is in communication connection with the direct injection injector driver through a serial port.

Further, background software of the upper computer operation interface is compiled by LabVIEW.

Further, the logic control module may control the current to pass through a pre-magnetization phase, a peak phase, a hold first phase, a hold second phase, and a shutdown phase.

Further, the time of the pre-magnetization stage can be set through the upper computer operation interface.

Further, the voltage value corresponding to the current in the peak stage can be set through the upper computer operation interface.

Further, the time for maintaining the current of the first stage can be set through the upper computer operation interface.

Further, the time for maintaining the current of the second stage can be set through the upper computer operation interface.

The invention has the advantages of lower cost, flexible parameter configuration, pre-magnetization function, simple control interface and convenient use by testing personnel.

The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.

Drawings

FIG. 1 is a schematic diagram of a direct injection injector driver according to a preferred embodiment of the present invention;

FIG. 2 is a diagram of injection drive control signals of the present invention;

FIG. 3 is a circuit diagram of the power module of the present invention;

FIG. 4 is a logic and current acquisition circuit diagram of the present invention;

fig. 5 is a circuit diagram of the switching tube driving circuit of the invention.

Detailed Description

The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.

In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.

The fuel injector driver with adjustable full parameters is used for driving an electromagnetic high-pressure injection fuel injector of an engine to inject fuel into a cylinder, and comprises a power supply module, a voltage control module and a voltage control module, wherein the power supply module is used for providing filtered stable voltage and voltage boosted by the module for the fuel injector, and the boosted voltage range is 20-120V; the logic control module is a core control module of the oil sprayer driver, and the oil sprayer control current is made to accord with a pre-designed current waveform through logic control so as to complete the operations of opening, peak value, keeping, closing and the like of the oil sprayer; the current detection module is used for detecting the control current of the oil sprayer and feeding the control current back to the controller to perform accurate closed-loop control operation; the control module is used for controlling the boosting value of the boosting circuit, the state of a logic circuit switching tube and the current control of the oil sprayer; the working state of the oil sprayer driver can be judged through the current detection module; the power supply module can adjust the output voltage of the power supply module by changing the boosting ratio of the booster circuit. The stable output voltage and current are provided for the oil injector through the filter circuit; the logic control module controls specific voltage at different moments to switch on the oil sprayer by controlling the on-off of the multi-way switch tube to obtain the required oil sprayer current and accurately control the oil sprayer; the control module is a core module of the oil sprayer driver, the whole control and detection of the oil sprayer are completed by controlling the boosting value of the boosting circuit, the logic circuit and the current detection circuit, and meanwhile, the control module is communicated with a computer through the serial port module.

The boost circuit of the power supply module consists of a boost circuit, a voltage stabilizing module, a current collecting module and a voltage collecting module; the filtering module consists of a low-pass filtering capacitor and a voltage stabilizing capacitor, and the module performs voltage stabilizing operation on the power supply voltage; the logic control module consists of a power switch (MOS) tube, an MOS tube driver and an optical coupling isolation circuit; the current acquisition module consists of an amplifier and a low-pass filter; the control module consists of a 32-bit 80MHz single chip microcomputer and a protection circuit; the singlechip protection circuit mainly prevents the problems of overcurrent, overvoltage and the like of the acquired signals and ensures the stable work of the singlechip; the current and the oil injection behavior of the oil injector in the working process can be detected, and the working state of the oil injector can be further determined. According to the working state of the oil sprayer, the work of the oil sprayer is protected through the protection current, and faults of overheating, overlarge current, open circuit, short circuit and the like of the oil sprayer are prevented.

The control algorithm of the booster circuit is PID control, and the algorithm of the logic control circuit is switch control. The protection module is used for monitoring abnormal phenomena in the working process of the oil sprayer driver and protecting the device.

As shown in fig. 1, the full-parameter adjustable injector driver includes a power supply module, a logic control module, a current collection module, a control chip module, and a fault diagnosis module.

As shown in fig. 3, the power supply module includes a boost module and a filter module, the boost module is controlled by a duty ratio (PWM) signal output by the control chip module, and performs boost operation through the boost circuit, and at the same time, performs closed-loop control on the boost module through voltage acquisition and current acquisition. The boosting ratio can be controlled by a computer upper computer and is used for meeting the requirements of different oil injectors on parameters. The filtering module consists of a low-pass filter and a voltage limiting module, wherein the low-pass filter is used for stabilizing the power voltage, and the voltage limiting module protects the circuit and prevents components from being damaged due to overlarge voltage.

As shown in fig. 4 and 5, the output voltage is logically controlled by the MOS transistor, and in the peak voltage stage, the voltage output end of the boost module is connected to enable the high voltage to be communicated with the injector through the switch tube, at this time, the high voltage is applied to the two ends of the injector, the valve of the injector is rapidly opened, when the injector is completely opened, the boost end is disconnected, the power supply end is connected, at this time, the low voltage of the power supply is used for supplying power to the injector, so that the opening of the valve of the injector can be ensured, and the failure of the injector due to overheating of. The module isolates the control end from the driving end through the optical coupling isolation circuit, and plays a role in protecting the control chip module. In the process of controlling the oil sprayer, relevant parameters of the oil sprayer are received from an upper computer, the parameters are distributed to different modules through a control chip, and the on-off of different switch circuits are regulated by using a logic circuit, so that the oil spraying process is realized.

Meanwhile, in order to accurately control various parameters of the oil injector, the current acquisition module monitors the current of the oil injector in real time, and sends a signal to the control chip module after filtering, and the control chip module ensures that the current waveform is a determined waveform in the working process of the oil injector through closed-loop control.

The invention mainly changes the current amplitude A shown in figure 2₁，A₂，A₃，A₄While varying the discharge time t₁，t₂，t₃，t₄And there is no coupling relation between the parameters,can be adjusted and changed freely.

It should be noted that the number of injectors driven by the full parameter adjustable injector driver is not limited to 4, and may be adjusted according to the needs of experiments and tests.

The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.