Solenoid valve for common rail fuel injector with automatic matching of two-stage resistance

Abstract

The invention discloses a solenoid valve for a common rail fuel injector with automatic matching of a two-stage resistance. The solenoid valve comprises a copper rod, a glass fiber, a heat shrinkablepipe, a valve shell, a valve core assembly, a pin-type connecting port and a two-stage resistance selection structure. The solenoid valve can be adapted to the design of a fuel injector body with different heights, and a moving actuator is approached without distance limitation; two-gear electromagnetic force is automatically changed, the rapid response of the needed fuel injection action is achieved, the coil resistance is automatically adjusted to change gear, the electromagnetic force is automatically increased, and a function of the mechanical increase of fuel injection quantity is achieved; the demand of a user for fast increase of oil volume can be met; from the mechanical aspect, the conversion of double frequency is achieved; quick opening and closing of a needle valve is achieved,and thus fuel injection control is achieved; the combination of the glass fiber and a copper material is adopted, the solenoid valve can work normally at temperature up to 600 DEG C; the solenoid valve can be close to a fuel injection nozzle to reduce the force transmission and delay; and the fast response is greatly improved.

Description

technical field [0001] The invention relates to a solenoid valve, in particular to a novel solenoid valve for a common rail fuel injector with two-stage resistance automatic matching, and belongs to the technical field of diesel engines. Background technique [0002] At present, with the country's increasing requirements for diesel engine emissions, traditional mechanically regulated diesel engines have been gradually replaced by electronically controlled diesel engines. The injector of the fuel injection system, which is a key component of a diesel engine, has also developed from the hydraulic mechanical injector in the past to the current electronically controlled injector. higher. For the key component of the electronically controlled fuel injector, solenoid valve control is generally used at present, and the pressure in the control chamber is controlled through the oil inlet and outlet holes to realize the common rail injector structure of needle valve opening and closi...

AI Technical Summary

Problems solved by technology

[0004] 1. Due to structural limitations and other factors, the solenoid valve can only be installed on the top of the injector. For engines that need to be buried deep under the cylinder head, the existing injectors cannot meet the requirements

[0005] 2. When the fuel injector needs to increase the fuel injection quantity in response to the demand, it needs to be limited by the resistance and inductance characteristics of the solenoid valve. Its response time is fixed, and it can only be realized by increasing the output of the control unit to control the pulse width of the solenoid valve signal.

Solenoid valves of ordinary injectors cannot withstand such a harsh environment

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