Ignition device with ignition coil

Patent metadata

Field	Value
Publication number	US-9166381-B2
Application number	US-201414202841-A
Country	US
Kind code	B2
Filing date	Mar 10, 2014
Priority date	Mar 8, 2013
Publication date	Oct 20, 2015
Grant date	Oct 20, 2015

Abstract

An ignition device includes an ignition coil with a primary coil and a secondary coil, a spark plug with center and ground electrodes for discharge therebetween, and a voltage limiting circuit. The voltage limiting circuit limits voltage applied between the electrodes of the spark plug such that the voltage has an absolute value limited within a predetermined voltage limiting value. The voltage limiting value is differentiated from each other in first and second stages. The first stage is defined as a period in which an initial discharge peak ends, the initial discharge peak being initially generated by electric energy. The second stage is defined as a period after the end of the initial discharge peak. The voltage limiting value in the first stage is lower than the voltage limiting value in the second stage.

First claim

What is claimed is:

1. An ignition device, comprising:
an ignition coil provided with a primary coil and a secondary coil which are magnetically coupled with each other;
a spark plug provided with a center electrode and a ground electrode, discharge sparks being generated between the center electrode and the ground electrode by an application of voltage between the center and ground electrodes, the voltage being applied using electric energy responding to magnetic energy stored…

Assignees

• Denso Corp

Inventors

• Hayashi Naoto
• Terada Kanechiyo
• Oono Takashi

Classifications

• H01T15/00 Primary

  Electricity · mapped topic

• F02P9/002

  Mechanical Engineering · mapped topic

• F02P3/0552

  Mechanical Engineering · mapped topic

• F02P3/055

  Mechanical Engineering · mapped topic