JPS60128947U

JPS60128947U - Injector drive circuit for electronically controlled fuel injection system

Info

Publication number: JPS60128947U
Application number: JP1546684U
Authority: JP
Inventors: 紺野　昌良
Original assignee: 自動車機器技術研究組合
Priority date: 1984-02-08
Filing date: 1984-02-08
Publication date: 1985-08-29

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図はインジェクタのコイル、に流れる電流波形図、
第２図は本考案の動作原理を説明する回路構成図、第３
図は本考案の動作原理を説明する信　　号のタイム・チ
ャートである。１・・・・・・バッテリ電圧検出回路、２，６・・・・
・・スイッチ、３．　７．　９．　１０．　１６・・・
・・・抵抗、４・・：・・・　　−′パルス発振回路、
５・・・・・・トリガ回路、８・・・・・・電流コント
ローイレ回１１１，１７−−−−−−トランジスタ、１
２・・・・・・ツェナー拳ダイオード、１３・・・・・
・インジェクタ、１４，１５，２０・・・・・・ダイオ
ード、１８・・・・・・コンデンサ、１９・・・・・・
励起コイル、２１・・・・・・バッテリ、２２・・・・
・・デジタル制御回路。Figure 1 is a diagram of the current waveform flowing through the injector coil.
Figure 2 is a circuit diagram explaining the operating principle of the present invention;
The figure is a signal time chart explaining the operating principle of the present invention. 1... Battery voltage detection circuit, 2, 6...
...Switch, 3. 7. 9. 10. 16...
...Resistance, 4...:... -'Pulse oscillation circuit,
5...Trigger circuit, 8...Current control circuit 111, 17----Transistor, 1
2... Zener fist diode, 13...
・Injector, 14, 15, 20... Diode, 18... Capacitor, 19...
Excitation coil, 21...Battery, 22...
...Digital control circuit.

Claims

[Scope of utility model registration request]

An injection pulse signal is generated based on an injection timing signal and a valve opening time signal generated from a digital control circuit according to the operating state of the internal combustion engine, and the injection pulse signal is used to generate a first injector connected in series to the coil of the injector of the internal combustion engine. A device that controls a switching element includes a voltage detection circuit that detects a drop in power supply voltage, a switch that operates a changeover switch using the output of the detection circuit, and a pulse signal that receives the injection timing signal as input by operating the switch. A second switching element is connected in series with the output pulse oscillation circuit and an excitation coil that closes at the rising edge of the pulse signal and opens at the falling edge of the pulse signal, and a second switching element is connected in series with the excitation coil that closes the circuit at the rising edge of the pulse signal and opens at the falling edge of the pulse signal. An injector drive circuit for an electronically controlled fuel injection device, comprising: an addition circuit that adds a back electromotive voltage to a coil of the injector. −