US 11,473,549 B2Granted

Ignition apparatus

AssigneeMitsubishi Electric Corporation

InventorsToshifumi Nakamura, Takahiko Inada

Life of this patent

Estimating the term…

Loading patent…

Abstract

An object is to reduce the required numbers of connector pins and A/D converters, without degrading the detection accuracy. There is provided an ignition apparatus which includes: ignition plugs provided for multiple cylinders; an ignition coil provided for each cylinder, and having a primary coil and a secondary coil magnetically coupled to the primary coil and connected to the ignition plug; switching devices each for switching between application and shut-off of current to the primary coil; a primary-voltage-signal separator provided for each cylinder, for inputting thereto a voltage of the primary coil and outputting the voltage as a primary signal; a primary-signal combiner for electrically combining together each primary signal corresponding to each cylinder, to thereby output a composite primary signal; and a primary-voltage-information detector for inputting thereto the composite primary signal, to thereby output primary voltage information of each cylinder.

Claims11

Dependent claims

An ignition apparatus, comprising:

ignition plugs provided for multiple cylinders of an internal combustion engine, respectively;
ignition coils provided for the cylinders, respectively, wherein each of the ignition coils have a primary coil and a secondary coil that is magnetically coupled to the primary coil and connected to corresponding one of the ignition plugs;
switches provided for the cylinders, respectively, to switch between a current application state in which current is supplied to the primary coil, and a current shut-off state in which current supply to the primary coil is shut off;
primary-voltage-signal separators provided for the cylinders, respectively, for inputting thereto a voltage of the primary coil and outputting the voltage as a primary signal, wherein each of the primary-voltage-signal separators comprises a high-voltage side resistor and corresponding one of the switches;
a primary-voltage-information detector comprising a low-voltage side resistor, and a voltage converter that reads out a detection voltage divided by the high-voltage side resistor and the low-voltage side resistor, as primary voltage information of corresponding one of the cylinders;
and
a circuit junction to which the low-voltage side resistor of the primary-voltage-information detector is connected, and the high-voltage side resistor of each of the primary-voltage-signal separators is connected via the switches when the switches are in the current application state.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/210,605Filed 24 Mar 2021
Priority: JP JP2020-10203512 Jun 2020
Published: US 2021/0388806 A116 Dec 2021
Granted: 18 Oct 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

F02P 3/0554
Opening or closing the primary coil circuit with semiconductor devices: using digital techniques
F02P 7/077
Of circuit-makers or -breakers, or pick-up devices adapted to sense particular points of the timing cycle: circuits therefor, e.g. pulse generators
F02P 17/12
Testing of ignition installations, e.g. in combination with adjusting ; Testing of ignition timing in compression-ignition engines: testing…
F02P
Ignition, other than compression ignition, for internal-combustion engines