# US 5,345,903 A · Engine stop control device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,345,903 A - Document ID: US5345903A - Status: Granted - Kind: A - Application number: 08/144,750 - Filed: 1993-10-27 - Granted: 1994-09-13 - Earliest claimed: 1992-10-27 - Assignees: Sanshin Kogyo Kabushiki Kaisha - Inventors: Hitoshi Motose; Hidetoshi Ishigami - Web page: https://patentgrep.com/patent/US5345903A ## CPC - F02D 7/02: Controlling fuel injection where fuel is injected by compressed air - F02D 41/22: Safety or indicating devices for abnormal conditions {(in air/fuel ratio feedback systems F02D41/1495, in electric control linkage F02D11/107, in purge control systems F02M25/0809)} - F02M 69/08: characterised by the fuel being carried by compressed air into main stream of combustion-air - F02P 9/002: {Control of spark intensity, intensifying, lengthening, suppression (by means of current control in the storage devices F02P3/05, F02P3/09, during starting F02P15/12)} - F02P 15/006: {Ignition installations combined with other systems, e.g. fuel injection (to advance or to retard the ignition spark F02P5/045)} - F02B 2075/025: {two} - F02B 2075/125: {Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber} - F02B 2075/1808: {two} - F02D 41/042: {for stopping the engine} - F02D 2400/04: Two-stroke combustion engines with electronic control - Y02T 10/12: Improving ICE efficiencies - F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W) - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF - 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) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A control system for a multiple cylinder, direct fuel injected, spark ignited, internal combustion engine that protects the fuel injectors by precluding the possibility of firing of the spark plugs at a time when a fuel injector is open and if the kill switch has been turned on. The control circuit precludes the disabling of the ignition circuits until all fuel injectors of the engine are in their closed positions. ## Claims ### Claim 1 A fuel injected, spark ignited, internal combustion engine having a cylinder, a fuel injector for injecting fuel into said cylinder and having an injection valve operable between an opened position and a closed position, a spark plug for firing a charge in said cylinder, an ignition circuit for firing said spark plug, a kill switch for disabling said ignition circuit for stopping said engine, and control means for precluding the disabling of said ignition circuit when said kill switch is closed until said injection valve is closed. ### Claim 2 (depends on 1) A fuel injected, spark ignited, internal combustion engine as set forth in claim 1 wherein the control means further precludes disabling of the ignition circuit at a time when the ignition circuit is also receiving a signal to fire the spark plug. ### Claim 3 (depends on 1) A fuel injected, spark ignited, internal combustion engine as set forth in claim 1 wherein the engine is provided with multiple cylinders, multiple fuel injectors and multiple spark plugs and the disabling of the ignition circuits for all of the spark plugs is delayed upon actuation of the kill switch until all of the injections valves are in their closed positions. ### Claim 4 (depends on 3) A fuel injected, spark ignited, internal combustion engine as set forth in claim 3 wherein the control means further precludes disabling of the ignition circuit at a time when the ignition circuit is also receiving a signal to fire one of the spark plugs. ### Claim 5 A method of operating a fuel injected, spark ignited, internal combustion engine having a cylinder, a fuel injector for injecting fuel into said cylinder and having an injection valve operable between an opened position and a closed position, a spark plug for firing a charge in said cylinder, an ignition circuit for firing said spark plug, a kill switch for disabling said ignition circuit for stopping said engine, said method comprising steps of precluding the disabling of said ignition circuit when said kill switch is closed until said injection valve is closed. ### Claim 6 (depends on 5) A method as set forth in claim 5 wherein the method further precludes disabling of the ignition circuit at a time when the ignition circuit is also receiving a signal to fire the spark plug. ### Claim 7 (depends on 5) A method as set forth in claim 5 wherein the engine is provided with multiple cylinders, multiple fuel injectors and multiple spark plugs and the disabling of the ignition circuits for all of the spark plugs is delayed upon actuation of the kill switch until all of the injections valves are in their closed positions. ### Claim 8 (depends on 7) A method as set forth in claim 7 wherein the control means further precludes disabling of the ignition circuit at a time when the ignition circuit is also receiving a signal to fire one of the spark plugs.