Fuel injector control apparatus for cylinder injection type internal combustion engine
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02M-051/00
F02M-051/08
출원번호
US-0916558
(2004-08-12)
우선권정보
JP-2003-418593(2003-12-16)
발명자
/ 주소
Oono,Takahiko
출원인 / 주소
Mitsubishi Denki Kabushiki Kaisha
대리인 / 주소
Sughrue Mion, PLLC
인용정보
피인용 횟수 :
4인용 특허 :
4
초록▼
A fuel injector control apparatus for a cylinder injection type engine includes driving circuits each shared by plural fuel injectors classified groupwise and having one ends connected in common to a potential source, switching means (13, 17, 19) connected to the potential source for turning on/off
A fuel injector control apparatus for a cylinder injection type engine includes driving circuits each shared by plural fuel injectors classified groupwise and having one ends connected in common to a potential source, switching means (13, 17, 19) connected to the potential source for turning on/off driving currents supplied to the injectors of a same group, a fuel quantity/injection timing arithmetic means (2) for determining a fuel supply quantity and a fuel injection timing on the basis of outputs from various sensors (1), driving circuits (10, 20) for firing the switching means in response to output of the fuel quantity/injection timing arithmetic means (2), and a ground fault identifying/discriminating means (2) for specifying a fault location upon occurrence of a ground fault. When the fault location is specified, fuel injection from other injector of the injector group to which the fault suffering injector belongs is stopped.
대표청구항▼
What is claimed is: 1. A fuel injector control apparatus for a cylinder injection type internal combustion engine having a plurality of cylinders, comprising: a plurality of injector groups each including a predetermined number of fuel injectors for injecting fuel into the associated cylinders, res
What is claimed is: 1. A fuel injector control apparatus for a cylinder injection type internal combustion engine having a plurality of cylinders, comprising: a plurality of injector groups each including a predetermined number of fuel injectors for injecting fuel into the associated cylinders, respectively, wherein driving coils for driving said fuel injectors which belong to a same injector group have ends connected to a common potential source; a plurality of switching means connected to said common potential source of said injector groups, respectively, for turning on/off driving currents supplied to said driving coils of said fuel injectors belonging to the same group upon being fired; fuel quantity/injection timing arithmetic means for arithmetically determining a fuel supply quantity and a fuel injection timing for said plurality of fuel injectors on the basis of information derived from outputs of various types of sensors; a plurality of driving circuits provided in correspondence to said injector groups, respectively, for generating an injector driving signal for firing said switching means in response to an output of said fuel quantity/injection timing arithmetic means; and ground fault identifying/discriminating means for detecting occurrence of a ground fault in relation to said injector group and specifying a ground fault occurrence location at which said ground fault is taking place upon detection thereof, wherein said fuel quantity/injection timing arithmetic means is so designed that when said ground fault occurrence location is specified by said ground fault identifying/discriminating means, said fuel quantity/injection timing arithmetic means stops fuel injection from other fuel injector(s) of the injector group to which the fuel injector specified as suffering the ground fault belongs. 2. A fuel injector control apparatus according to claim 1, wherein said fuel quantity/injection timing arithmetic means is so designed that when said ground fault occurrence location is specified by said ground fault identifying/discriminating means, said fuel quantity/injection timing arithmetic means stops not only the fuel injection from the other fuel injector(s) of the injector group to which the fuel injector specified as suffering the ground fault belongs but also the fuel injection from said fuel injector suffering the ground fault and the fuel injections from the fuel injectors belonging to the other injector group(s). 3. A fuel injector control apparatus according to claim 1, further comprising: injection confirming means for detecting at least one of an OFF surge signal making appearance upon firing of said fuel injector and a current flowing to said switching means; and misfire confirming means for detecting occurrence/nonoccurrence of misfire in said engine, wherein when abnormality of a given one of said fuel injector is detected by said injection confirming means and when occurrence of complete misfire in the cylinder corresponding to said abnormal injector is not detected by said misfire confirming means, said ground fault identifying/discriminating means determines that occurrence of the ground fault has been detected. 4. A fuel injector control apparatus according to claim 1, further comprising: siding operation control means for carrying out operation control during a siding operation of a motor vehicle equipped with said cylinder injection type internal combustion engine, wherein said siding operation control means is designed to control at least one of driving parameter for said fuel injectors and load parameter of said engine in a suppressing direction during said siding operation. 5. A fuel injector control apparatus according to claim 4, wherein said siding operation control means is designed such that during said siding operation, an upper limit of an engine rotation number (rpm) within a range in which driving of said fuel injectors is enabled is so limited as not to exceed a predetermined engine rotation number smaller than that in an ordinary operation state of said engine. 6. A fuel injector control apparatus according to claim 4, wherein said siding operation control means is designed such that during said siding operation, an upper limit imposed on a maximum driving pulse width for said fuel injectors is so limited as not to exceed a predetermined pulse width narrower than that in an ordinary operation state of said engine. 7. A fuel injector control apparatus according to claim 4, wherein said siding operation control means is designed such that during said siding operation, a maximum intake air quantity of said engine is so limited as not to exceed a predetermined maximum intake air quantity smaller than that in an ordinary operation state of said engine. 8. A fuel injector control apparatus according to claim 4, further comprising: fuel pressure detecting means for detecting as a fuel pressure a pressure of fuel at which said fuel is injected from said fuel injector; and variable fuel pressure control means for controlling through a feedback control said fuel pressure in accordance with a predetermined desired pressure conforming with an operating state of said engine by making use of said fuel pressure as feedback information, wherein said siding operation control means is designed that during said siding operation, a lower limit pressure of said desired fuel pressure is higher than a predetermined pressure inclusive which is higher than the fuel pressure in an ordinary operation state of said engine. 9. A fuel injector control apparatus for a cylinder injection type internal combustion engine having a plurality of cylinders, comprising: a plurality of injector groups each including a predetermined number of fuel injectors which inject fuel into the associated cylinders, respectively, wherein driving coils which drive said fuel injectors which belong to a same injector group have ends connected to a common potential source; a plurality of switches connected to said common potential source of said injector groups, respectively, which turn on/off driving currents supplied to said driving coils of said fuel injectors belonging to the same group upon being fired; a fuel quantity/injection timing arithmetic circuit which arithmetically determines a fuel supply quantity and a fuel injection timing for said plurality of fuel injectors on the basis of information derived from outputs of various types of sensors; a plurality of driving circuits provided in correspondence to said injector groups, respectively, which generate an injector driving signal which fire said switches in response to an output of said fuel quantity/injection timing arithmetic circuit; and a ground fault identifying/discriminating circuit which detects occurrence of a ground fault in relation to said injector group and specifies a ground fault occurrence location at which said ground fault is taking place upon detection thereof, wherein said fuel quantity/injection timing arithmetic circuit is so designed that when said ground fault occurrence location is specified by said ground fault identifying/discriminating circuit, said fuel quantity/injection timing arithmetic circuit stops fuel injection from other fuel injector(s) of the injector group to which the fuel injector specified as suffering the ground fault belongs. 10. A fuel injector control apparatus according to claim 9, wherein said fuel quantity/injection timing arithmetic circuit is so designed that when said ground fault occurrence location is specified by said ground fault identifying/discriminating circuit, said fuel quantity/injection timing arithmetic circuit stops not only the fuel injection from the other fuel injector(s) of the injector group to which the fuel injector specified as suffering the ground fault belongs but also the fuel injection from said fuel injector suffering the ground fault and the fuel injections from the fuel injectors belonging to the other injector group(s). 11. A fuel injector control apparatus according to claim 9, further comprising: an injection confirming circuit which detects at least one of an OFF surge signal making appearance upon firing of said fuel injector and a current flowing to said switches; and a misfire confirming circuit which detects occurrence/nonoccurrence of misfire in said engine, wherein when abnormality of a given one of said fuel injector is detected by said injection confirming circuit and when occurrence of complete misfire in the cylinder corresponding to said abnormal injector is not detected by said misfire confirming circuit, said ground fault identifying/discriminating circuit determines that occurrence of the ground fault has been detected. 12. A fuel injector control apparatus according to claim 9, further comprising: a siding operation control circuit which carries out operation control during a siding operation of a motor vehicle equipped with said cylinder injection type internal combustion engine, wherein said siding operation control circuit is designed to control at least one of driving parameter for said fuel injectors and load parameter of said engine in a suppressing direction during said siding operation. 13. A fuel injector control apparatus according to claim 12, wherein said siding operation control circuit is designed such that during said siding operation, an upper limit of an engine rotation number (rpm) within a range in which driving of said fuel injectors is enabled is so limited as not to exceed a predetermined engine rotation number smaller than that in an ordinary operation state of said engine. 14. A fuel injector control apparatus according to claim 12, wherein said siding operation control circuit is designed such that during said siding operation, an upper limit imposed on a maximum driving pulse width for said fuel injectors is so limited as not to exceed a predetermined pulse width narrower than that in an ordinary operation state of said engine. 15. A fuel injector control apparatus according to claim 12, wherein said siding operation control circuit is designed such that during said siding operation, a maximum intake air quantity of said engine is so limited as not to exceed a predetermined maximum intake air quantity smaller than that in an ordinary operation state of said engine. 16. A fuel injector control apparatus according to claim 12, further comprising: a fuel pressure detecting circuit which detects as a fuel pressure a pressure of fuel at which said fuel is injected from said fuel injector; and a variable fuel pressure control circuit which controls through a feedback control said fuel pressure in accordance with a predetermined desired pressure conforming with an operating state of said engine by making use of said fuel pressure as feedback information, wherein said siding operation control circuit is designed that during said siding operation, a lower limit pressure of said desired fuel pressure is higher than a predetermined pressure inclusive which is higher than the fuel pressure in an ordinary operation state of said engine.
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이 특허에 인용된 특허 (4)
Grembowicz Conrad G. (Peoria IL) Harrell Brad (Morton IL), Driver circuit for solenoid operated fuel injectors.
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