Power supply filter circuit of GDI high-pressure oil injector

Abstract

The utility model discloses a GDI high-pressure oil injector power supply filter circuit, which comprises a vehicle power supply, a filter circuit and a power supply circuit, the vehicle power supply is electrically connected with the power supply input end of the filter circuit, and the output end of the filter circuit is electrically connected with the input end of the power supply circuit. A control signal input end of the power supply circuit is electrically connected with an output end of an external control circuit, an output end of the power supply circuit is electrically connected with the GDI high-pressure fuel injector, direct-current voltage is output through a vehicle power supply, and the direct-current voltage is boosted by the power supply circuit and then is output to the GDI high-pressure fuel injector for driving. The power supply filter circuit of the GDI high-pressure oil injector has the effects of converting the voltage of a vehicle power supply into the voltage required by the GDI high-pressure oil injector and driving the GDI high-pressure oil injector.

Description

Technical Field

[0001] The utility model relates to the technical field of high-pressure fuel injectors, in particular to a power supply filtering circuit for a GDI high-pressure fuel injector. Background Art

[0002] A gasoline direct injection (GDI) engine, abbreviated as a GDI engine, is a hot topic in the research and development of internal combustion engines abroad in recent years. The emergence of gasoline direct injection technology has brought the automotive engine technology into a brand-new era. It has the tendency to replace traditional gasoline engines and diesel engines in the 21st century and become the most ideal power device for sedans.

[0003] Currently, a GDI engine directly injects gasoline into the cylinder and uses the fuel atomization on the in-cylinder air flow and piston surface to form a mixture with air for combustion. The GDI engine has good working stability and load performance. At the same time, the low-temperature starting performance has been significantly improved. It can achieve stratified combustion, greatly improving fuel economy. Its fuel consumption can reach the level of a turbocharged direct injection diesel engine, and the turbocharging device is omitted, saving a complex high-pressure injection system. The GDI engine can use lean combustion technology, and the air-fuel ratio can be as high as 40:1, or even up to 100:1 at most, making the power and torque higher than those of traditional gasoline engines, and the fuel consumption, noise, and carbon dioxide emissions are all lower. The uniformity, instantaneous response, starting performance, etc. of the GDI engine are all greatly improved compared with traditional gasoline engines. Therefore, automotive manufacturers in various countries are vigorously developing this GDI engine with advanced technology and excellent performance.

[0004] Now a power supply circuit for driving a GDI high-pressure fuel injector is proposed. Summary of the Utility Model

[0005] In view of the above problems, a power supply filtering circuit for a GDI high-pressure fuel injector is provided to solve the deficiencies in the prior art.

[0006] The specific technical solution is as follows:

[0007] A power supply filtering circuit for a GDI high-pressure fuel injector includes a vehicle power supply, a filtering circuit, and a power supply circuit. The vehicle power supply is electrically connected to the power input end of the filtering circuit. The output end of the filtering circuit is electrically connected to the input end of the power supply circuit. The control signal input end of the power supply circuit is electrically connected to the output end of an external control circuit. The output end of the power supply circuit is connected to a GDI high-pressure fuel injector drive circuit;

[0008] The power supply circuit includes a capacitor C3, an inductor L2, a MOS transistor M1, a sampling resistor R2, a diode D1, a capacitor C5, and a capacitor C6. One end of the inductor L2 is grounded through the capacitor C3. The common end of the inductor L2 and the capacitor C3 serves as an input end and is electrically connected to the output end of the filtering circuit. The other end of the inductor L2 is electrically connected to the drain of the MOS transistor M1. The source of the MOS transistor M1 is grounded through the sampling resistor R2. The gate of the MOS transistor M1, the source of the MOS transistor M1, and the end of the sampling resistor R2 far from the MOS transistor M1 are all connected to an external control circuit. The common end of the inductor L2 and the MOS transistor M1 is sequentially electrically connected to the source of the MOS transistor M1 through the diode D1 and the capacitor C5. An RC absorption circuit is connected in parallel across both ends of the diode D1. The capacitor C6 is connected in parallel across both ends of the capacitor C5. The common end of the diode D1 and the capacitor C5 serves as an output end and is connected to the GDI high-pressure injector drive circuit.

[0009] The above-mentioned GDI high-pressure injector power supply filtering circuit further has the following feature. The filtering circuit includes an inductor L1, a capacitor C1, and a capacitor C2. Both ends of the inductor L1 are grounded through the capacitor C1 and the capacitor C2 respectively. The common end of the inductor L1 and the capacitor C1 serves as a power input end and is electrically connected to the vehicle power supply. The common end of the inductor L1 and the capacitor C2 serves as an output end and is electrically connected to the input end of the power supply circuit.

[0010] The above-mentioned GDI high-pressure injector power supply filtering circuit further has the following feature. The RC absorption circuit includes a resistor R1 and a capacitor C4. The resistor R1 and the capacitor C4 are connected in series and then connected in parallel across both ends of the diode D1.

[0011] The above-mentioned GDI high-pressure injector power supply filtering circuit further has the following feature. The external control circuit is an integrated chip PT2001.

[0012] In summary, the beneficial effects of this solution are as follows:

[0013] In the GDI high-pressure injector power supply filtering circuit provided by the present invention, a DC voltage is output by the vehicle power supply. After the power supply circuit boosts the above DC voltage, it is output to drive the GDI high-pressure injector. The GDI high-pressure injector power supply filtering circuit provided by the present invention has the effect of converting the vehicle power supply voltage into the voltage required by the GDI high-pressure injector and driving it. Description of the Drawings

[0014] Figure 1 It is a structural block diagram of the GDI high-pressure injector power supply filtering circuit of the present invention. Detailed Embodiments

[0015] The technical solution of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative work belong to the scope of protection of the present utility model.

[0016] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments may be combined with each other.

[0017] The present utility model will be further described below in conjunction with specific embodiments, but it is not limited to the present utility model.

[0018] Figure 1 is a structural block diagram of the power supply filtering circuit of the GDI high-pressure injector of the present utility model. As Figure 1 shown, the GDI high-pressure injector power supply filtering circuit provided in this embodiment includes a vehicle power supply, a filtering circuit, and a power supply circuit. The vehicle power supply is electrically connected to the power input end of the filtering circuit. The output end of the filtering circuit is electrically connected to the input end of the power supply circuit. The control signal input end of the power supply circuit is electrically connected to the output end of an external control circuit. The output end of the power supply circuit is electrically connected to the GDI high-pressure injector.

[0019] In the above embodiment, the filtering circuit includes an inductor L1, a capacitor C1, and a capacitor C2. Both ends of the inductor L1 are grounded through the capacitor C1 and the capacitor C2 respectively. The common end of the inductor L1 and the capacitor C1 is used as the power input end and is electrically connected to the vehicle power supply. The common end of the inductor L1 and the capacitor C2 is used as the output end and is electrically connected to the input end of the power supply circuit.

[0020] In the above embodiment, the power supply circuit includes a capacitor C3, an inductor L2, a MOS transistor M1, a sampling resistor R2, a diode D1, a capacitor C5, and a capacitor C6. One end of the inductor L2 is grounded through the capacitor C3. The common end of the inductor L2 and the capacitor C3 is used as the input end and is electrically connected to the output end of the filtering circuit. The other end of the inductor L2 is electrically connected to the drain of the MOS transistor M1. The source of the MOS transistor M1 is grounded through the sampling resistor R2. The gate of the MOS transistor M1, the source of the MOS transistor M1, and the end of the sampling resistor R2 far from the MOS transistor M1 are all connected to the external control circuit. The common end of the inductor L2 and the MOS transistor M1 is sequentially electrically connected to the source of the MOS transistor M1 through the diode D1, the capacitor C5. An RC absorption circuit is connected in parallel across both ends of the diode D1. The capacitor C6 is connected in parallel across both ends of the capacitor C5. The common end of the diode D1 and the capacitor C5 is used as the output end and is connected to the GDI high-pressure injector drive circuit.

[0021] It should be noted that the ceramic capacitor C5 connected in parallel with the electrolytic capacitor C6 is used to suppress the ringing caused by the parasitic parameters of the electrolytic capacitor.

[0022] In the above embodiment, the RC absorption circuit includes a resistor R1 and a capacitor C4. The resistor R1 and the capacitor C4 are connected in series and then connected in parallel across both ends of the diode D1.

[0023] It should be noted that the RC absorption circuit is used to suppress the tail-end ringing on the switching node.

[0024] In the above embodiment, the external control circuit is an integrated chip PT2001.

[0025] It should be noted that the integrated chip PT2001 collects the inductor current of the GDI high-pressure injector power supply circuit through differential signals and controls the switching of the NMOS to achieve VBOOST boost.

[0026] The above are only the preferred embodiments of the present invention, and do not limit the implementation manners and protection scope of the present invention. For those skilled in the art, it should be able to realize that all the equivalent replacements and obvious changes made by using the content of the specification of the present invention should be included in the protection scope of the present invention.

Claims

1. A GDI high-voltage injector power supply filter circuit, characterized in that: It includes a vehicle power supply, a filter circuit and a power supply circuit, wherein the vehicle power supply is electrically connected to the power supply input terminal of the filter circuit, the output terminal of the filter circuit is electrically connected to the input terminal of the power supply circuit, the control signal input terminal of the power supply circuit is electrically connected to the output terminal of the external control circuit, and the output terminal of the power supply circuit is electrically connected to the GDI high-pressure injector; The power supply circuit includes a capacitor C3, an inductor L2, a MOS tube M1, a sampling resistor R2, a diode D1, a capacitor C5 and a capacitor C6. One end of the inductor L2 is grounded through the capacitor C3. The common end of the inductor L2 and the capacitor C3 is electrically connected to the output end of the filter circuit as an input end. The other end of the inductor L2 is electrically connected to the drain of the MOS tube M1. The source of the MOS tube M1 is grounded through the sampling resistor R2. The gate of the MOS tube M1, the source of the MOS tube M1 and the end of the sampling resistor R2 away from the MOS tube M1 are all connected to an external control circuit. The common end of the inductor L2 and the MOS tube M1 is electrically connected to the source of the MOS tube M1 through the diode D1 and the capacitor C5 in sequence. An RC absorption circuit is connected in parallel at both ends of the diode D1. The capacitor C6 is connected in parallel to both ends of the capacitor C5. The common end of the diode D1 and the capacitor C5 is connected to the GDI high-pressure injector drive circuit as an output end.

2. A GDI high-pressure fuel injector power supply filter circuit according to claim 1, characterized in that: The filter circuit includes an inductor L1, a capacitor C1 and a capacitor C2, two ends of the inductor L1 are grounded through the capacitor C1 and the capacitor C2 respectively, a common end of the inductor L1 and the capacitor C1 is electrically connected to the vehicle power supply as a power input end, and a common end of the inductor L1 and the capacitor C2 is electrically connected to the input end of the power circuit as an output end.

3. A GDI high-pressure fuel injector power supply filter circuit according to claim 1, characterized in that: The RC absorption circuit includes a resistor R1 and a capacitor C4. The resistor R1 and the capacitor C4 are connected in series and then connected in parallel to two ends of the diode D1.

4. A GDI high-pressure fuel injector power supply filter circuit according to claim 3, characterized in that: The external control circuit is an integrated chip PT2001.

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