Ignition device

Patent metadata

Field	Value
Publication number	US-10041463-B2
Application number	US-201515302552-A
Country	US
Kind code	B2
Filing date	Apr 9, 2015
Priority date	Apr 10, 2014
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

According to an ignition device, a first switching unit applies a voltage between electrodes of by spark plug by turning on/off energization from an on-vehicle battery to a primary coil. Further, a second switching unit applies a voltage having the same direction as a spark discharge generated by turning on/off the first switching unit between the electrodes of the spark plug by supplying electrical energy accumulated in a booster circuit into a primary coil. Accordingly, it is possible to greatly reduce a complexity of the on/off switching of the first and second switching units compared to a conventional technology.

First claim

The invention claimed is:

1. An ignition device for an internal combustion engine that supplies electrical energy from two ignition coils composed of a first ignition coil and a second ignition coil with respect to a single spark plug, the ignition device comprising:
a first switching unit that starts a main ignition by applying a voltage between electrodes of the spark plug by turning on and off energization to a primary coil of the first ignition coil from an on-vehicle battery;
a booster circuit that boosts a voltage of the on-vehicle battery and accumulates the electrical energy; and
a second switching unit that superimposes a current having the same direction as the spark discharge generated by turning on and off the first switching unit between the electrodes of the spark plug by supplying the electrical energy accumulated in the booster circuit into the primary coil of the second ignition coil; wherein,
a spark discharge having the same direction as the spark discharge generated by turning on and off the first switching unit is continued between the electrodes of the spark plug by supplying the electrical energy in the booster circuit into a negative side of the primary coil of the second ignition coil by the second switching unit.

2. The ignition device according to claim 1 , wherein,
the primary coil of the second ignition coil has a first end and a second end, the first end is connected to a positive electrode of the on-vehicle battery, the second end is connected to a ground via a freewheel diode, wherein the second end of the primary coil of the second ignition coil is on the negative side of the primary coil of the second ignition coil; and
an energy supply line that supplies the electrical energy into the primary coil of the second ignition coil from the booster circuit is connected to a connection point of the primary coil of the second ignition coil and the freewheel diode.

3. The ignition device according to claim 1 , wherein,
the primary coil of the second ignition coil has a first end and a second end, the first end is connected to a ground, the second end is connected to the ground via the freewheel diode, wherein the second end of the primary coil of the second ignition coil is on the negative side of the primary coil of the second ignition coil; and
an energy supply line that supplies the electrical energy into the primary coil of the second ignition coil from the booster circuit is connected to a connection point of the primary coil of the second ignition coil and the freewheel diode.

4. The ignition device according to claim 1 , wherein,
the ignition device includes a magnet having a reversed bias polarity that is incorporated into a magnetic path where a magnetic flux generated by energization of the primary coil of the first ignition coil passes.

5. The ignition device according to claim 4 , wherein
the magnet is a first magnet; and
the ignition device includes a second magnet provided separately from the first magnet having a reversed bias polarity that is incorporated into a magnetic path where a magnetic flux generated by energization of the primary coil of the first ignition coil passes.

6. The ignition device according to claim 2 , wherein,
the ignition device includes a magnet having a reversed bias polarity that is incorporated into a magnetic path where a magnetic flux generated by energization of the primary coil of the first ignition coil passes.

7. The ignition device according to claim 6 , wherein
the magnet is a first magnet; and
the ignition device includes a second magnet provided separately from the first magnet having a reversed bias polarity that is incorporated into a magnetic path where a magnetic flux generated by energization of the primary coil of the first ignition coil passes.

8. The ignition device according to claim 3 , wherein,
the ignition device includes a magnet having a reversed bias polarity that is incorporated into a magnetic path where a magnetic flux generated by energization of the primary coil of the first ignition coil passes.

9. The ignition device according to claim 8 , wherein
the magnet is a first magnet; and
the ignition device includes a second magnet provided separately from the first magnet having a reversed bias polarity that is incorporated into a magnetic path where a magnetic flux generated by energization of the primary coil of the first ignition coil passes.

10. The ignition device according to claim 1 , wherein,
a turn ratio of the primary coil of the second ignition coil is smaller than a turn ratio of the primary coil of the first ignition coil.

11. The ignition device according to claim 1 , wherein the supplying of the electrical energy in the booster circuit into the negative side of the primary coil of the second ignition coil causes a current to flow from the primary coil of the second ignition coil to the positive electrode of the on-vehicle battery.

Assignees

• Denso Corp

Inventors

• Toriyama Makoto
• Takeda Shunichi
• Terada Kanechiyo
• Nakayama Satoru
• Oono Takashi

Classifications

• F02P3/0892

  using digital techniques · CPC title

• F02P3/08 Primary

  Layout of circuits (for low tension F02P3/10) · CPC title

• F02P9/007

  by supplementary electrical discharge in the pre-ionised electrode interspace of the sparking plug, e.g. plasma jet ignition · CPC title

• F02P15/10

  having continuous electric sparks · CPC title

• F02P5/15

  Digital data processing · CPC title