Method for inspecting ignition device for internal combustion engine and inspection device
AssigneeDenso Corporation
InventorsTetsuya Miwa, Atsuya Mizutani, Hiromi Hiramatsu
Life of this patent
Estimating the term…
Abstract
An inspection object constructed of an ignition plug and an ignition coil is inserted in an inspection housing that does not have a ground electrode. A voltage generated in the ignition coil is measured while the inspection object is housed in the inspection housing. Electrical discharge does not occur because the ground electrode is not provided. Therefore, the voltage generated in the ignition coil is properly measured for quality inspection of the ignition coil.
Claims7
A method for inspecting an ignition device for an internal combustion engine having a combustion chamber, the device including an ignition plug for discharging in the combustion chamber, an ignition coil for supplying a high voltage to the ignition plug, and a cylindrical ignition device housing for housing the ignition plug and the ignition coil, the ignition device further including a ground electrode that is fixed to the ignition device housing, and a portion of the ignition device housing functions as an outer peripheral core of the ignition coil, wherein the device is inspected by measuring a voltage generated in the ignition coil, comprising:
- preparing a cylindrical inspection housing for an inspection of the ignition device;
- inserting the ignition coil in the inspection housing;
- and
- measuring the voltage generated in the ignition coil that is housed in the inspection housing, wherein
- the inspection housing functions as a housing substituted for the ignition device housing and an outer peripheral core of the ignition coil during the inspection, and
- the measuring is performed using the inspection housing that differs from the ignition device housing especially in that a ground electrode is not fixed to the inspection housing.
An inspection device for an ignition device for an internal combustion engine having a combustion chamber, the ignition device including an ignition plug for discharging in the combustion chamber, an ignition coil for supplying a high voltage to the ignition plug, and a cylindrical ignition device housing for housing the ignition plug and the ignition coil, the ignition device further including a ground electrode that is fixed to the ignition device housing, and a portion of the ignition device housing functions as an outer peripheral core of the ignition coil, comprising:
- a cylindrical inspection housing that functions as a housing substituted for the ignition device housing and an outer peripheral core of the ignition coil during the inspection;
- and
- a voltage measuring means for measuring a voltage generated in the ignition coil in a condition that the ignition coil is housed in the inspection housing.
A method for inspecting an ignition device for an internal combustion engine having a combustion chamber, the device including an ignition plug for discharging in the combustion chamber, an ignition coil for supplying a high voltage to the ignition plug, and a cylindrical substitute/inspection housing for housing the ignition plug and the ignition coil, and a portion of the substitute housing functions as an outer peripheral core of the ignition coil, wherein the device is inspected by measuring a voltage generated in the ignition coil, comprising:
- maintaining the substitute housing ungrounded;
- providing electrical isolation between the ignition plug and the substitute housing by maintaining a distance between a tip of the ignition plug and a housing end adjacent to the tip for preventing an electrical discharge;
- and
- measuring the voltage generated in the ignition coil housed in the substitute housing.
Dependencies are inferred from the claim text.