Injector dual power supply bilateral drive clamp pressure freewheeling circuit module

Abstract

The invention discloses a fuel injector dual-power bi-side driving clamping pressure follow current circuit module which comprises a field-effect transistor driving chip connected with the pulse signal output end of a microcontroller. The high side pulse driving signal output end and the low side pulse driving signal output end of the field-effect transistor driving chip are connected with a grid resistor of a corresponding high side power field-effect transistor and a grid resistor of a corresponding low side power field-effect transistor respectively. The drain electrode of the high side power field-effect transistor is connected with a high-voltage power source; the high-voltage power source is connected with the positive electrode of a bootstrap diode through a divider resistor, and the negative electrode of the bootstrap diode is connected with the high potential output end of the field-effect transistor driving chip. The drain electrode of the low side power field-effect transistor is connected with the positive electrode of a diode, and the negative electrode of the diode is connected with the high-voltage power source. A fuel injector electromagnetic valve coil is connected between the drain electrode of the high side power field-effect transistor and the drain electrode of the low side power field-effect transistor. The positive electrode of a bootstrap capacitor is connected with the negative electrode of the bootstrap diode. The fuel injector dual-power bi-side driving clamping pressure follow current circuit module has the advantage that the duty ratio of PWM keeping waves is changed to achieve the optimal energy utilization effect.

Description

technical field [0001] The invention relates to an engine fuel injector drive circuit module, in particular to a fuel injector dual-power bilateral drive clamp pressure freewheeling circuit module. Background technique [0002] The engine fuel injector is a device that injects fuel into the combustion chamber at a certain temperature and pressure according to the specified fuel injection timing, fuel injection law and fuel injection volume. The performance of the fuel injector directly affects the fuel atomization combustion efficiency. , and then affect various performance indicators of the engine including emission, power, and economy. [0003] The core component of the electronically controlled injector is the solenoid valve, which generates a magnetic field under the action of electromagnetic induction. The armature inside the injector is affected by the magnetic field force. When the magnetic field force received by the armature is greater than the preload force of the ...

AI Technical Summary

Problems solved by technology

The current electronically controlled fuel injector drive circuit has the following shortcomings: 1. The rapid discharge of the solenoid valve of the fuel injector (less than 10 microseconds) cannot be realized, so that the fuel injector does not respond in time and the control accuracy is low; 2. The fuel injection The energy of the electromagnetic valve of the solenoid valve is released in the form of resistance heating, resulting in unnecessary waste of energy and the discharge resistance is easy to heat and burn, resulting in damage to the drive circuit

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