# US 5,349,930 A · High tension cord cover with misfire detecting capacitor for internal combustion engine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,349,930 A - Document ID: US5349930A - Status: Granted - Kind: A - Application number: 08/053,690 - Filed: 1993-04-29 - Granted: 1994-09-27 - Earliest claimed: 1992-05-01 - Assignees: Honda Giken Kogyo Kabushiki Kaisha - Inventors: Shigeru Maruyama; Yuichi Shimasaki; Masaki Kanehiro; Takuji Ishioka; Shigeki Baba; Takashi Hisaki - Web page: https://patentgrep.com/patent/US5349930A ## CPC - G01R 15/16: using capacitive devices - F02P 17/12: Testing characteristics of the spark, ignition voltage or current (testing of sparking plugs H01T13/60) - F02B 2275/18: DOHC [Double overhead camshaft] - F02F 7/006: {Camshaft or pushrod housings} - F02P 2017/006: {using a capacitive sensor} - F02P 2017/125: {Measuring ionisation of combustion gas, e.g. by using ignition circuits} - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - F02P: IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES ({anti-pollution means for internal-combustion engines F02B17/00}; specially adapted for rotary-piston or oscillating-piston engines F02B53/12; {ignition of gas turbine plants F02C7/26; ignition of jet propulsion plants F02K9/95; starting of combustion engines F02N9/00}; ignition of combustion apparatus in general, glowing plugs F23Q; measuring of physical variables in general G01; controlling in general G05; data processing in general G06; electrical components in general see Section H; {ignition coils H01F38/12}; sparking plugs H01T13/00) - F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G) - F02F: CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES ## Abstract A high tension cord cover disposed at an engine cylinder head for covering a groove in which high tension cords pass through for supplying an ignition voltage current to a spark plug of the engine. The cover is made of an insulation material and having a cord retaining section at the bottom surface facing the groove for retaining the cords in parallel with each other. A plate like conductor is embedded in the cover keeping a predetermined distance therefrom and sandwiching a portion of the insulation cover, whereby a capacitor, which constitutes a capacitive divider in cooperation with a second capacitor for detecting misfire through the ignition voltage, is formed between the conductive cores of the high tension cords and the plate like conductor. The conductor can be electrically shielded. A second member made of an insulation material can be provided in the groove underneath the cover for retaining the cords such that the conductor embedded in the cover is kept the predetermined distance from the cords. ## Claims ### Claim 1 A high tension cord cover for covering at least one high tension cord having a conductive core therein carrying an ignition voltage current for an internal combustion engine, comprising: a member made of an insulation material for holding the at least one high tension cord; and a second conductor embedded in the member keeping a predetermined distance from the high tension cord and sandwiching a portion of the member between said high tension cord and said second conductor such that a capacitor is formed. ### Claim 2 (depends on 1) A cover according to claim 1, wherein the member is a cover for covering a groove formed at a portion of the engine for receiving the at least one high tension cord and the cover is formed with a cord retaining section at a surface facing the groove. ### Claim 3 (depends on 2) A cover according to claim 2, wherein the portion comprises a cylinder head cover of the engine. ### Claim 4 (depends on 2) A cover according to claim 2, wherein the cord retaining section formed at the cover is a recess having a semicircular cross section and the high tension cord is placed in the recess. ### Claim 5 (depends on 2) A cover according to claim 2, wherein the second conductor is embedded at a location between the surface facing the groove and a second surface opposite thereto. ### Claim 6 (depends on 2) A cover according to claim 2 , wherein the cord retaining section formed at the cover comprises recesses configured side by side and each having a semicircular cross section and a plurality of the high tension cords are placed in the individual recesses. ### Claim 7 (depends on 6) A cover according to claim 6, wherein the second conductor is embedded at a location between the surface formed with the recesses and a second surface opposite thereto. ### Claim 8 (depends on 7) A cover according to claim 7, wherein the second conductor are embedded at the location keeping the predetermined distance from each of the high tension cords. ### Claim 9 (depends on 8) A cover according to claim 8, wherein the second conductor has a plate like shape. ### Claim 10 (depends on 9) A cover according to claim 9, wherein the width of the second conductor is not less than the total width of the recesses. ### Claim 11 (depends on 6) A cover according to claim 6, wherein a cut is formed between the adjacent recesses. ### Claim 12 (depends on 1) A cover according to claim 1, wherein the second conductor is electrically shielded. ### Claim 13 (depends on 5) A cover according to claim 5, wherein a shield member is disposed between the second surface and the second conductor for electrically shielding the same. ### Claim 14 (depends on 13) A cover according to claim 13, wherein an insulator is interposed between the shield member and the second conductor. ### Claim 15 (depends on 7) A cover according to claim 7, wherein a shield member is disposed between the second surface and the second conductor for electrically shielding the same. ### Claim 16 (depends on 15) A cover according to claim 15, wherein an insulator is interposed between the shield member and the second conductor. ### Claim 17 A high tension cord cover for covering at least one high tension cord having a conductive core therein carrying an ignition voltage current for an internal combustion engine, comprising: a first member made of an insulation material for holding the at least one high tension cord; a second member made of an insulation material and disposed at a fixed position with respect to the first member; and a second conductor embedded in the second member keeping a predetermined distance from the high tension cord and sandwiching a portion of the second member between said high tension cord and said second conductor such that a capacitor is formed. ### Claim 18 (depends on 17) A cover according to claim 17, wherein either of the first and second members comprises a cover for covering a groove formed at a portion of the engine for receiving the at least one high tension cord. ### Claim 19 (depends on 18) A cover according to claim 18, wherein the portion comprises a cylinder head of the engine. ### Claim 20 (depends on 17) A cover according to claim 17, wherein the second member comprises the cover for covering the groove and the first member is placed at the inner position in the groove. ### Claim 21 (depends on 20) A cover according to claim 20, wherein the first member is formed with a cord retaining section at a surface opposing the second member. ### Claim 22 (depends on 21) A cover according to claim 21, wherein the cord retaining section formed at the first member comprises recesses configured side by side and each having a semicircular cross section and a plurality of the high tension cords are placed in the individual recesses. ### Claim 23 (depends on 22) A cover according to claim 22, wherein the second conductor is embedded in the second member at a position keeping the predetermined distance from each of the high tension cords retained at the first member. ### Claim 24 (depends on 23) A cover according to claim 23, wherein the second conductor has a plate like shape. ### Claim 25 (depends on 24) A cover according to claim 24, wherein the width of the second conductor is not less than the total width of the recesses. ### Claim 26 (depends on 22) A cover according to claim 22, wherein a cut is formed between the adjacent recesses. ### Claim 27 (depends on 17) A cover according to claim 17, wherein the second conductor is electrically shielded.