Ignition control device

Patent metadata

Field	Value
Publication number	US-10704522-B2
Application number	US-201916386352-A
Country	US
Kind code	B2
Filing date	Apr 17, 2019
Priority date	Apr 10, 2014
Publication date	Jul 7, 2020
Grant date	Jul 7, 2020

Abstract

An ignition control device includes a main ignition circuit to generate a spark discharge to a spark plug by controlling energization of a primary coil of an ignition coil for an internal combustion engine, an energy supply circuit that supplies energy based on a discharge continuation signal by controlling the energization of the primary coil during the spark discharge started by the operation of the main ignition circuit to supply a secondary current in the same direction as a main ignition continuously in a secondary coil of the ignition coil, a secondary current command circuit for outputting a command value of the secondary current based on the secondary current command signal, and an ignition control unit for setting signal values of the secondary current command signal and the discharge continuation signal.

First claim

What is claimed is:

1. An ignition control device comprising:
a main ignition circuit to generate a spark discharge to a spark plug by controlling energization of a primary coil of an ignition coil for an internal combustion engine;
an energy supply circuit that supplies energy based on a discharge continuation signal which is a command value for continuing the spark discharge by controlling the energization of the primary coil during the spark discharge started by the operation of the main ignition circuit to supply a secondary current in the same direction as that used for a main ignition continuously in a secondary coil of the ignition coil;
a secondary current command circuit for outputting a command value of the secondary current based on the secondary current command signal; and
an ignition control unit for setting signal values of the secondary current command signal and the discharge continuation signal; wherein
the ignition control unit sets the secondary current command signal so as to increase the secondary current when an engine speed of the internal combustion engine is higher compared to when the engine speed is lower, and sets the discharge continuation signal so as to shorten an energy supply period.

2. In the ignition control device according to claim 1 , wherein
the secondary current command circuit has a plurality of signal lines, and
the secondary current command signal has setting value information of a combination of potentials of the plurality of signal lines according to the engine speed of the internal combustion engine.

3. In the ignition control device according to claim 2 , wherein
the ignition control device further includes a feedback circuit that detects the secondary current and feeds back the secondary current to the energy supply circuit.

4. In the ignition control device according to claim 1 , wherein
the ignition control unit outputs the secondary current command signal to the secondary current command circuit, and outputs the discharge continuation signal to the energy supply circuit.

5. In the ignition control device according to claim 4 , wherein
the ignition control device further includes a feedback circuit that detects the secondary current and feeds back the secondary current to the energy supply circuit.

6. In the ignition control device according to claim 1 , wherein
the ignition control unit includes a composite signal transmission unit that outputs a signal including the secondary current command signal and the discharge continuation signal as a composite signal.

7. In the ignition control device according to claim 6 , wherein
the ignition control device further includes a feedback circuit that detects the secondary current and feeds back the secondary current to the energy supply circuit.

8. In the ignition control device according to claim 1 , wherein
the ignition control device further includes a feedback circuit that detects the secondary current and feeds back the secondary current to the energy supply circuit.

Assignees

• Denso Corp

Inventors

• Takeda Shunichi
• Niwa Mitsunobu
• Morita Hisaharu

Classifications

• F02P3/0442 Primary

  using digital techniques (F02P3/0456, F02P3/053, F02P3/0554, F02P3/0558 take precedence) · CPC title

• Y02T10/40

  Engine management systems · CPC title

• F02P17/12

  Testing characteristics of the spark, ignition voltage or current (testing of sparking plugs H01T13/60) · CPC title

• F02P5/15

  Digital data processing · CPC title

• F02P3/05 Primary

  for control of the magnitude of the current in the ignition coil (during starting F02P15/12) · CPC title